12th Physics Objective II Electric Current

[00:00:41]Om [nasal sound] [sound of clearing throat] Jai Hind, I Neeraj Chaudhary from Physics Bihar heartily welcome all of you children to my YouTube channel Physics Bihar, so all the brothers and sisters please join first and today's class is very good, it is wonderful, it is simple and what you have to do is take a copy and what do you do in that copy?

[00:01:51]Write down objectives from 1 to 35 first.

[00:01:53]And what you have to do after writing is to tick before yourself. Isn't it? For example, if one has B then you should put B in your copy.

[00:02:02]And after doing this, what you should do is that in the end you should see how many of yours are correct out of 35. Is 25 out of 35 correct or is 35 out of 35 correct or is 32 out of 35 correct. How true it is. You will see these people. Ok? Let's see tomorrow whether he will listen tomorrow or not.

[00:02:25][Nasal sound] Let me start the class and our first topic, that is, the first objective question is coming and you know it is such a good question that you can easily solve it yourself.

[00:02:41]Meaning there are not many hard questions. Hi sir. Hi kid.

[00:02:46]First of all, all the brothers and sisters should join together.

[00:02:48]First all the children should join and first all of you should join brothers [nasal sound] and I hope you all will like today's question because I have brought a very wonderful set of questions today, let us now move towards the class. My first question is saying that the SI unit of electric current is. The SI unit of current is. Isn't it? The SI unit of electric current is what is the SI unit of current? The option is yours, it is ampere, volt, ohm, watt. Tell me which of these answers will be correct for you?

[00:03:29][nasal sound] Yes brother, why wo n't I listen to what I will teach you today? Yes sir. I am Sweety, welcome Sweety. All children, first join quickly and share it with your friends. Babu, it has to be sent to Sona, to colleagues and to everyone. Ok? And I also want to tell them that you guys should also see it.

[00:03:51]My class is 11th sir, the child will be in 11th class, it will start from 8:00 am. Ok? There will be no 11th class now. Come on, tell me the answer to this.

[00:04:00]What will be the answer to this? Brother, what will be the SI unit of electric current? Yes, that is absolutely correct. Its SI unit is ampere. Done. My name is Swati. You are welcome Swati.

[00:04:12]Okay [sound of clearing throat] what's the answer to that? The answer to this will be ampere. That is, what is the SI unit of electric current? So its unit is ampere.

[00:04:22][nasal sound] Come forward. Our second question is what is the resistance of an ideal ammeter.

[00:04:31]What is the resistance of an ideal ammeter? This is what you are being asked. Option A is done and void.

[00:04:35]B. Done, very little. C is talking too much. D is speaking Anant. The resistance of an ideal ammeter is, what is the resistance of an ideal ammeter? Option A is saying zero B is saying very small C has become very large D has become infinite so you guys comment its answer in the comment box my name is Yasar my name is Yasar ok fine whatever your name is it is very good isn't it done brother I have seen your name is Yasar Yasar Yasar brother I am guessing your name is yes ok let's come forward so what will be its answer you guys comment its answer what is the resistance of an ideal ammeter? Please tell me quickly.

[00:05:22][sound of clearing throat] What is the resistance of an ideal ammeter? You tell me.

[00:05:29]Ok? The answer to this is I am from Hi Sir. I am from UP.

[00:05:39]Welcome brother from UP. You are welcome. There was a very famous song, UP wala thumka, dance like a hero, so you are welcome to those of you from UP, come on my name is Sachin Kumar, welcome Sachin, all of you kids are welcome, okay but no one is answering this, everyone is just giving their introduction, everyone is giving their introduction, okay there is no problem, so what is the resistance of an ideal ammeter, it is zero, brother how much is it for me? It is zero. Whenever it speaks, the resistance of your ideal ammeter speaks. You have to remember there is zero. And this is what the ideal voltmeter says. If Adarsh ​​had said voltmeter then what would have been our answer for it? It would become infinite. Remember, the ideal ammeter will say what will be the resistance? will be zero. And when the ideal voltmeter speaks, what will our resistance be? Then it will become infinite. That means we will have our answer to this question.

[00:06:38]Our option number A will be correct.

[00:06:40]Ok? Yes, let's move ahead.

[00:06:48]Look here it is saying that the ideal voltmeter has resistance.

[00:06:52]I just said that an ideal voltmeter has resistance. Option A became zero, B became too little, C became too much. It is done, it has become infinite.

[00:07:01]The resistance of an ideal ammeter is zero, very small, very large and infinite. So comment your answer brother.

[00:07:09]What will be your answer to this? Isn't it? Please comment your answer to this. What will be the answer to this? Please tell me the answer to this, brother.

[00:07:20]Yes. What will be the answer to this body? It will be infinite. That means infinity will be its answer. Remember, what is the resistance of an ideal voltmeter? So it is infinite. It is infinite. Ok? Option number will be D. Very good. Fabulous.

[00:07:37]Ok? All the children are getting D. Very good. go ahead.

[00:07:43]Let's say it says that the color code of carbon resistance has a yellow value.

[00:07:49]You must have read about the carbon color code, in this code it is saying what is the code of yellow color? Isn't it? The first option is asking whether you have one, two, three or four? That means the yellow code is asking you.

[00:08:04][sound of clearing throat] He is saying in color code of carbon resistance the value of yellow color is that is asking you the value of yellow color. That means the yellow colored one is asking you for the code. So quickly brother, tell me the code of yellow color, what is the code of yellow color?

[00:08:19]What does carbon color code contain?

[00:08:22]A child is telling D. A brother D is telling.

[00:08:24]All the children out there, tell me what will be the answer to this? What is the color code for yellow in carbon color code? Tell me four options number D, right? Let's go and if there are any kids who want to tell, please tell me the code of yellow color brother, yes come, you have to look carefully, do you know what happens to it, first it is black, first it is black, then it is brown, then it is red, then it is orange, then it is yellow, it happens like this, then what happens to you, it is blue, it is done, it is blue, something like this happens, yes Aman Kumar, it is four. Ok.

[00:09:00]Sudhir Sudhir Singh D is speaking. Ok.

[00:09:04]Ah very good. All the kids are telling D.

[00:09:08]All the kids are telling D. Yes brother, what will be the answer to this? Yes, come. Black has a code of zero.

[00:09:12]Brown has one.

[00:09:16]How much does a red cost us? There are two.

[00:09:17]Orange has three. How much of our yellow? It is four. And how much of Blue is ours? It is five. This is our code. Prince Hello. Yes child. Hi. You guys are joining late.

[00:09:27]Yes. If yes, then how much will its answer body be? So what will be our yellow color code brother? So yellow color code will be ours will be four. Isn't it? It will become four. It will become four. Now see who this happens to?

[00:09:37]This is Brown's. This is our brown. This is our brown color.

[00:09:41]This belongs to us, it belongs to Bhura. Done.

[00:09:42]This is ours, it is Lal's.

[00:09:45]Whose is this ours? of yellow.

[00:09:47]Sorry, whose is this ours? It is orange, right? This is your brown. It is brown in colour. This is red.

[00:09:55]It happens to be orange. of orange.

[00:09:59]It is orange in colour. And who does this belong to? So this is ours, it is yellow.

[00:10:03]This is our yellow color. Ok? Let me move ahead.

[00:10:12]See next What is the next person saying? Speaking further, I am asking about the SI unit of specific resistance or resistivity.

[00:10:19]What is this resistance? I told you that the resistance in a wire of 1 meter square cross-sectional area and 1 meter long is called our resistivity. Isn't it?

[00:10:30]is called resistivity. Now tell me what is its symbol? I cry. Now what is this cry asking you? Asking for SI units. Isn't it? It is saying its option is saying oh meter, right? The meter on ohms is saying ampere meter or ohms. Saying the SI unit of specific resistance and resistivity is option A is done. Ohm meter, ohm meter, ampere meter and you're done.

[00:10:53]So brother, comment your answer to this.

[00:10:55]If you guys remember the formula, what is R equal to two? Row * L / A occurs. This is our formula. What will A do if you remove the row from here? Will do intu from R.

[00:11:08]That means it will become R * A. How much will it be now? Bye, our L will be done. So this R means resistance. And what is the unit of resistance? Om is done. Isn't it?

[00:11:18]And A means area. So its unit is meter square. What is L? There is length. What happens to the length? meter.

[00:11:25]So this was cut meter by meter. So how much answer will you get? Ohm * meter. Absolutely correct. You are absolutely right about all the children. Ohm * meter. Absolutely correct. What will be the answer to this? would be ohm*meter. My option number A will be corrected from here. It will be fine. Come on.

[00:11:44]You should remember one thing. If I had called the class at 7:00. The timing given was 7:00 pm.

[00:11:48]This means there may be some delay, is n't it? Isn't it? I was a little distracted and woke up after sleeping in class at 7:00. Woke up a little late.

[00:11:57]I was a little late. Due to which the children ran away. No problem.

[00:12:05]Look, the next question is given. Here he is saying [coughing sound] that there is a unit of electromotive force. Isn't it? It is the unit of electromotive force.

[00:12:16]The unit of electromotive force is What is the unit of electromotive force brother? You are being asked for units. Option A is Newton, Joule, Volt or Newton per Ampere. Tell me the answer to this. What will be the answer to this? You tell me in a hurry. What is the unit of electromotive force? Isn't it?

[00:12:39]What is the unit of electromotive force? So what is electromotive force speaking? So this is a kind of potential difference. Isn't it? This is the potential difference.

[00:12:44]So when you ask for its unit, what is its unit, brother? So its unit is volt.

[00:12:50]Which option number is getting correct for us?

[00:12:52]C, everything is going well for us from here. Yes sir, I will do the entire live class. You don't worry. It's okay, he's a child, right?

[00:12:59]I told you whether there is one child or 10 children or 100 children. I will do whatever work is mine.

[00:13:04]I have no problem. Isn't it? If work has to be done then it has to be done.

[00:13:07]What's the problem in doing it brother? Isn't it? Be it today or tomorrow, success pays off. You have to remember this, right? You will see that any child who prepares for UPSC works hard for 10 years.

[00:13:18]Works hard for 11 years.

[00:13:20]Still what happens? He does not succeed.

[00:13:22]Does this mean he will stop studying?

[00:13:24]No, he will not leave at all. And success is not achieved in a day or two. Isn't it?

[00:13:29]Success: Ravana also did penance. So it was not that I did penance for one day.

[00:13:33]Brahma ji was happy. No, earlier the sages and saints or those who did penance used to do so for hundreds of years. Just think about it for hundreds of years, thousands of years, they used to do penance for hundreds of years and then they used to please Lord Brahma or some God and after that they used to ask for its fruits, so penance brother, it takes time, it is not that something happens suddenly, this is also ours, I am also doing some of my work and if this work of ours is positive, be it today or tomorrow, it will also be successful, okay come here, next [sound of clearing throat] come, the next question board is given here, what happens to the specific resistance of a semiconductor when the temperature increases? Brother? You are asked about the specific resistance of a semiconductor when the temperature increases.

[00:14:16]What happens? Option A is saying it increases. Option B is saying it decreases. C is saying unchanged. D says zero says. Isn't it? With the increase of temperature the resistivity of semiconductor. Isn't it? It has increased. It was decreed. Remains unchanged or becomes zero. That is, what will be the resistance of the semiconductor when the temperature increases? He is asking you this. So friends, remember that if the temperature increases, the temperature increases and if this was a conductor, then the resistance of the conductor increases. Isn't it? The resistance of the conductor increases. But the opposite happens with semiconductors.

[00:14:50]What happens to you in a semiconductor? happens to.

[00:14:52]Hi Sir Rohit Pandey. Hi kid. Hello sir ji, most welcome brother to all the children. Hello, why are you all coming late? Isn't it?

[00:15:04]Whatever the time was, you people should have come on time, you should have come on time, Physics is in Bihar, right? Well, welcome brother, you people have come, it is a matter of great happiness, let me move ahead. Yes, so what is it in this brother, you are being asked about the resistance of a semiconductor when the temperature increases.

[00:15:22]Option A is saying it increases, B is saying it decreases, C is saying it remains unchanged, D is saying it becomes zero, so brother, remember if this was a conductor, if this was a conductor, then what would be the answer? Increases. Read it.

[00:15:35]What is your take here? A semiconductor is given. So what happens to you in semiconductors? The answer to this will be that yours decreases.

[00:15:41]Decrease means decrease. Option number: What happened to us? B Its correct answer is given. Isn't it? Your answer to seven is correct. Go ahead. Yes.

[00:15:52]Look here it is saying that it will be B of seven, sir. will be perfect. It will be B. Look here, it is saying that due to the flow of current at t time and I current, the heat generated in a conductor of resistance R means it is a conductor, it is saying that t time has passed, I current has passed and its resistance is R, so it is asking you the formula of the heat generated in it. Isn't it? Heat produced in a conductor of resistance R due to flow of current I for times T is option A is saying IRT B is saying I² RT so I R² T option C is saying I² RT and D is saying I² R² * T. You just remember Joule's law a little bit. Remember Joule's law.

[00:16:37]What did Mr. Jules say? You remember. Isn't it? That when current flows through a conducting wire, the heat produced is equal to what?

[00:16:46]This equals i² is equal to r * t.

[00:16:50]So which of these is your correct option? This correct option is yours. Option number C is done. i² * rt is your correct answer.

[00:16:59]Ok? Come on, there is some doubt somewhere, right? If there is a problem then you guys please comment that yes sir there is a problem. You are saying that we are not able to learn. If you feel any doubt anywhere, you can tell me and I will clear your doubt, okay and if you know the answer then you can also comment, it is not like that, you will keep staring like a donkey, brother, it will seem that you know the answer, the comment box is open, you have to comment in the comment box that yes sir, the answer to this will be [sound of clearing throat] oh okay child, but today many children are connected, many children are connected brother, if so many children get connected then I will go crazy and die brother. Let's move ahead.

[00:17:43]Look here how to proceed to the next question that there is a relation between the trailing velocity and the applied electric field.

[00:17:52]You are asked about the relationship between drift velocity and electric field.

[00:17:55]The relation between drift velocity and applied electric field is State the relation between it. The question is asking for the formula for the relationship between the tracking velocity and the electric field.

[00:18:06]What are you asking? vd proportional to v d what? Proportional e v d Proportional e² or vd = constant. So brothers, please comment your answer to this. What will be the answer to this? Isn't it? What will be the answer to this? Please comment quickly. Option number done. What is the relation between drift velocity and applied electric field? Hi sir.

[00:18:27]Yes baby, yes. Comment your answer to this brother.

[00:18:28]What will be the answer to this?

[00:18:33]Let's tell all the children that do you know what do you know brother, so what is vd, it is a proportional, it is proportional to e, right, what is vd proportional, it is e, you must have read that vd is equal to e * e / me, it is mass of electron into torque, if you remove all this then vd will become your proportional to whom, this will become proportional to the electric field, okay, so option number which is yours getting corrected, your b is getting corrected from here. Okay, the next question is yours. Here it is being said that the SI unit of electrical conductivity is The SI unit of conductivity is asking you. Done. The SI unit of electrical conductivity is Option A is yours.

[00:19:18]Ohm meter done. Ohm Inverse Meter Inverse Ohm Meter Inverse. Om is done. Please comment your answer to this. What will be the answer to this? So please comment your answer. Isn't it? What is the SI unit of electrical conductivity? Tell me quickly.

[00:19:32]Give the SI unit of conductivity. Please tell me the answer to question number 10.

[00:19:36]What is the SI unit of conductivity?

[00:19:40]A child of conductivity is speaking B is speaking.

[00:19:42]Absolutely correct. What will be the answer to this?

[00:19:44]Its answer will be B. What will be the answer to this brother? It will be B. Om will be inverse.

[00:19:48]Your meter will become inverse. Very awesome.

[00:19:51]Its answer will be B. Ok?

[00:19:56]Look at this. The next question is what will happen if we stretch a conductor wire of resistance r and change its length? Double it.

[00:20:05]Meaning an r is a resistor whose resistance value is given as r. Its length has to be stretched and doubled. Have to double it. Done. If it is doubled, what will be its new resistance? He is saying it will be 2r. It will become 4r. will be r/2 or r/4.

[00:20:20]Ok?

[00:20:21][sound of clearing throat] Look, it is saying if a conducting wire of resistance R is stretched to double its length, its new resistance will be, that is, it is the same thing, there is a wire of resistance R, if we stretch it and double its length, then what will be its resistance, so remember if resistance asks for new resistance, if new resistance asks, aunt will ask for resistance, then what has to be done, n² * r is the formula, n² * r has to be done. What is this n?

[00:20:52]How much have you multiplied? That has to be applied. How much have you multiplied? So how many times did you earn brother? So, it has been doubled. So put two 2 squared here and we get into r. So 2 squared into four is going to be r. Done? It will become into r. What will be my option number? The option will be corrected.

[00:21:09]B yours will be corrected. He says that he should pull it and triple its length. Whatever multiplication he tells you to do, you have to put it here. Whatever multiplication it says, you have to put it here.

[00:21:18]He will speak three times more. So if you put three here, the square of 3 will become 9R. If you say 10 times then the square of 10 will become 100R. Okay, right?

[00:21:24]You have to put here as many times as it says.

[00:21:26]You have to put that much here. Done.

[00:21:28]Okay, what happened to your option number? B yours is correct. Yes. Very good. Rohit Pandit B is telling. It's awesome.

[00:21:36]Everyone is telling about the remaining people also.

[00:21:39]Very beautiful. Very beautiful. Very beautiful.

[00:21:42]You guys have the answer, right? Very beautiful.

[00:21:44]Look ahead.

[00:21:46]Look at this.

[00:21:48][sound of clearing throat] This is your question and the SI unit of electric power is asking you.

[00:21:53]Asking for the SI unit of power. The SI unit of electric power is i.e. asking the SI unit of power. Is it watt, volt, ampere or henry? Now tell me what will be the answer to this?

[00:22:06]What will be the SI unit of power? You guys tell me this. Isn't it? All the brothers and sisters who are connected, please comment your answer that yes sir, this will be the SI unit of power. Now tell me. A will happen.

[00:22:19]Well, the kids must have started it.

[00:22:22]So the words are absolutely correct.

[00:22:24]What will be the SI of power? Watt will be What will happen to Shakti's SI brother? Watt will be And what is your question? This is a bilingual question.

[00:22:29]Bilingual question means your question is given in both Hindi and English medium.

[00:22:33]Very good. Fabulous. A will be its answer. Ok?

[00:22:42]Yes, this will happen, all the children come forward. Next question is kilowatt hour is the unit. What is the unit of kilowatt hour? Kilowatt hour is the unit of what is it? You have to tell this. The option is saying electrical power, electrical energy, torque or electric current? The options are electric power, electric energy, torque or electric current. You have to tell me what is the unit of your kilowatt hour? What is the unit of kilowatt hour? Please comment quickly brother.

[00:23:16]Comment your answer to this.

[00:23:19][coughing sound] Quickly brother, comment on the answer.

[00:23:22]What will be the answer to this? Yes, sir. A would be the child of electric power. A will not. A will not be the answer to this question. The answer to this question will be A.

[00:23:31]No. A will not.

[00:23:35]Kilowatt is a good kilowatt hour, right? Yes, it is kilowatt hour. Now look carefully first. The answer to this will not be A. No, it won't happen either.

[00:23:43]Yes, I am looking. Now some child is putting some child A. He is acting like a child.

[00:23:47]What's up friend? Satyam Satyam brother hello. Yes, they are saying hello welcome. You are welcome. Isn't it? Welcome brother.

[00:23:55]Look carefully, what will be the answer to this? Neither A nor C will happen. You tell me what will be the answer to this? B is there sir. Yes, what will be the answer to this? It will be B. Aunty, he is saying kilowatt hour.

[00:24:06]Look carefully brother. Kilowatt hour.

[00:24:08]Brother, remember kilowatt hour, you have read P = W / T. Have read w/T. This happens. Have you read W/T?

[00:24:15]What is P equal to? Sorry energy, right? [nasal sound] Yes. P equals how much? w/T happens. w/T happens. Now if you do this then W equals to P * T. What is w equal to?

[00:24:28]P*T happens. What is this P? The work gets done. The work gets done. He said, see, the work gets done.

[00:24:32]Now the work is equal, how much is your work? I have become powerful. What is Shakti Intu? There is time. There is time.

[00:24:40]What happens to Shakti now? Watt happens.

[00:24:43]We have watts of power. And what happens to time? Hour. What did it give for time? Listen carefully.

[00:24:50]Look into it carefully. Look at this question. The power given in this is taken in kilowatts. Whether it is watts or kilowatts, it doesn't matter. Power is measured in watts or kilowatts. We take kilowatts here.

[00:25:00]Hour is also a unit of time. So what should I put here? It takes an hour. So call it work or call it energy. What is the matter? There is only one.

[00:25:07]What happens after work and energy? There is only one. Isn't it? You must have read about work and energy also. So what will be our answer to this question brother? So the answer to this will be electrical energy. Option number B will be our correct one. Yes. Now even the child is telling everything. Yes. Now it is correct. Now it is correct. Isn't it? That's ok. I'll move ahead. And those children who are new to Physics Bihar, please subscribe to it. Isn't it? Please subscribe to your group and post this video in your circle. I'll move ahead.

[00:25:37]Look, the next question is saying aunty that 1 kilowatt hour is equal to. You must have read in 10th class that what is 1 kilowatt hour equal to, brother? 1 kilowatt hour is equal to what is 1 kilowatt hour equal to? The option became 3.6 * 10 to the power of 6 joules. B is saying 3.6 * 10 to the power of 5 joules.

[00:25:58]Option C is saying 10 to the power is 6 Joules and Option D is saying 3.6 * 10 to the power is 3 Joules. Now comment your answer to this. Now you comment on it. Comment your answer.

[00:26:09]Tell me brother, what is 1 kilowatt hour equal to?

[00:26:15]Tell me quickly.

[00:26:23][nasal sound] [coughing sound] [nasal sound] Come on brother, what will be its answer, its answer option number A will be correct, its option A will be correct, your number A will be correct, its correct answer will be A. A will be your correct answer.

[00:26:54]Let's move ahead now. There will be no brother.

[00:26:57]Its answer will be A correct. Yes, A is absolutely correct. Well Jigra Praveen, you have come.

[00:27:02]You guys have come very early in the morning. B will not.

[00:27:04]A: Its answer will be correct.

[00:27:10]Yes, it will be A.

[00:27:13]Now come forward. The next question is saying that the carbon color code has a value of red.

[00:27:18]Red color has value. The red color in the carbon color code is asking you for the value.

[00:27:23]Saying these color code these color code of carbon resistance the value of red color is asking your value of red color. Or the red one is asking you for a code. In option A it is saying zero. B is saying how much is yours? One is saying. In C, he is saying two. How much is your saying in D? If he is saying three then tell me quickly what is its value in carbon color code? So hello sir Rohit Pandit, this is sir, this is aunty, whose value is he asking in carbon color code [coughing sound] in carbon color code, your option number is C, option C, option C is absolutely correct, what will be your option number, C, its correct answer will be C, what will be its big C, this will be correct, let's see, it is black, it is brown, it is red, it has become zero, it has become one and this has become two for us, so what is the code of red, brother, the code of red for us is two.

[00:28:15]Every child must have read the wonderful carbon color code. Do you know what the code is? So. Ok? Let me move ahead.

[00:28:25]Everyone is right about the child. Look here it is saying that the specific resistance of a conducting wire depends on. There is a conductor wire which has a specific resistance.

[00:28:35]This Ro, Ro, what does it depend on? The specific resistance of a conducting wire depends on its, isn't it, depends on its, then it is saying your option, it is saying length, it is saying area of ​​cross section, nature of material, D is saying mass, come in Hindi, so area of ​​cross section on length, nature of material or it is saying mass, clear its answer quickly brothers, what will be its answer, tell me its answer, what will be it, on what does the specific resistance depend, so listen very carefully, if it says resistance, then resistance depends on all three.

[00:29:13]Resistance depends on all three. He used to say resistance. But what is in the question? Specific resistance.

[00:29:20]So specific resistance, you remember, depends on what? So it depends on the nature of the substance. Depends on the nature.

[00:29:28]Which option number? Option No. C Nature of the Material. The answer to this will be C.

[00:29:36]This option will become your C. Let's move ahead.

[00:29:41]Come in 18. Look at this. It is being said here that Kirchhoff's first law, that is, the law of junction, is based on which conservation principle?

[00:29:52]Kirchhoff's First Law Jackson's Rule is based on conservation of options. Here it is saying conservation of energy, conservation of mass, conservation of charge or conservation of momentum. Option A is done, energy is done, mass is done, charge is done or momentum is done. Tell me what will be the answer to this? Isn't it? Kirchhoff's first law obeys the conservation of Kirchhoff's first law would be A, sir. Yes, absolutely correct. No, the first law of Kirchhoff is that it follows conservation of charge. Whose brother is this to us?

[00:30:24]It follows charge conservation.

[00:30:26]Kirchhoff's first law is about conservation of charge and the second law works on conservation of energy. You will remember Kerchhoff's first on conservation of charge and second on conservation of energy. Isn't it? So which of us is getting the correct option for this question? C is getting corrected.

[00:30:43]Now look, the same next question has come.

[00:30:46]Here Bua Ray is saying that Kirchhoff's secondary law is based on which conservation principle? What does Kirchhoff's Second Law conserve? He is saying that Kirchhoff's second law, which is your loop, loops rule, is based on conservation of, that is, which one does it follow, brother, your option is done, conservation of energy, conservation of charge, conservation of momentum or conservation of mass, comment the answer quickly, child, you tell me the answer to this, you tell me the answer to this, you tell me the answer to this, yes many children are saying this, Sameer Gupta is saying this, yes, very awesome, what will be the answer to this? Energy conservation. It follows energy conservation.

[00:31:27]Ok? It follows energy conservation.

[00:31:29]Remembering Kirchhoff. When Kirchhoff's first law is stated, it is the junction law and it obeys the conservation of charge and when the second law is stated, it obeys the conservation of energy and it is the loop law. Isn't it? There is a loop rule.

[00:31:42]We call AO KL. One is called KVL. Kirchhoff's first law KCL. Kirchhoff's current law. One is KVL. Kirchhoff Voltage Law This is the second law of Kirchhoff. Let's look here [nasal sound] Houston Bridge is used for measuring. What do you use it to measure? Hust bridge is used to measure whom brother? Only high resistance, only low resistance, both high and low resistance or potential difference. Meaning what is the potential measurement? And why do you use the Hutstone Bridge? In what do you do yourself? The first one is saying only high resistance. B is saying only low resistance and C is saying both high and low resistance and D is done, you have your potential difference. Tell me the answer quickly. Done. Please tell me the answer to this quickly brother. A listen.

[00:32:47]Yes. Please comment your answer to this brother.

[00:32:50]What will be the answer to this? You guys tell me this. Isn't it?

[00:32:52]What does Hutster Bridge major in? You remember.

[00:32:54]If we had given this option, or if there was an option, instead of putting unknown resistance, then the tick would have been placed on the unknown resistance, right? So the answer to this will be no, it will not be A.

[00:33:04]Remember this. The hot stone measures high resistance as well as low resistance, meaning angle resistance.

[00:33:11]What happens in an angle like, say, Hutstone? it happens. This is what happens at Hutstone.

[00:33:14]Remember? This is how it happens. This is four- go resistance. This is how it happens. This is how it happens in stone. What happens in between? It is a galvanometer. Such is the galvanometer. This is how it happens. If you have read it, you will remember it. Now this is our drink. This is q. This is r.

[00:33:30]This is s. And the formula is converted to the formula p / q = r / s. These are four go resistances. Out of this, Konono will give the value of three Go. The value of AO will ask you. So whatever will be the value of the third or the value of the fourth, what will be the fourth, low resistance or high resistance, there is no problem, if you find out the value of the fourth then what will be its answer, its option will be for us, what will be our option, it will be D, sorry it will be C, both high and low resistance, meaning it can measure low resistance as well as high resistance, there is no problem. Isn't it? Its answer will be yours, option number will be C.

[00:34:08]Come on, now the children are giving the correct answers.

[00:34:11]A Jigra Praveen who is giving wrong will not be yours. Your answer to this will be C. Isn't it? Please read it carefully. Where do you guys' minds lie, brother?

[00:34:25]Let's [nasal sound] do it.

[00:35:19]Yes, he must be leaving now. He must be leaving now. I'll read it one more time.

[00:35:24]What is the main use of a potentiometer? What do you use the potentiometer for? Potentiometer is mainly used to measure. What do you mainly use it for? What do you use Main for? Isn't it? What do you use Main for? Yes, what do you use main for? Option A What will happen to you? There is resistance, there is electromotive force of the cell, there is current or there is charge. Okay, right? Resistance is done, EMF of cell is done, current is done or your charge is done. So remember why do you use a potentiometer? So you use a potentiometer to measure the electromotive force of the cell.

[00:36:01]Ok? Let's move on.

[00:36:09]Look, this question is saying that the SI unit of potential gradient is.

[00:36:14]SI unit of potential gradient Every child can tell it. You are being asked the SI unit of potential gradient.

[00:36:19]The SI unit of potential gradient is voltmeter.

[00:36:27]Metered on volts. Volt per meter square became ampere per meter. Isn't it? It became volt meter, volt per meter, volt per meter square or ampere per meter.

[00:36:38]Tell me quickly what will happen to this?

[00:36:41]Tell me quickly brother.

[00:36:51]You tell me what will be the answer to this? Very simple, it is wonderful. You can easily tell this.

[00:37:03]What will happen brother kids why are you putting C right why are you putting C brother volt per meter square tell me it will not happen tell me this is wrong this is wrong C yours is wrong C is wrong C yours is wrong C it is done C C there will be no answer to this C there will be no answer to this C there will be no answer to this. I have said it once, do you understand? Hey Raju Bhai, what are you doing child? It will not be like Sunil Bhai. I once said, which languages ​​should I speak in Urdu, Persian, Japanese, Telugu, brother?

[00:37:48]C will not be the answer. There will be no meter square on volt.

[00:37:50]Cut this first. This wo n't happen. Tell me Baba, what will happen to this?

[00:37:55]Maybe maybe saying maybe maybe. Wow, amazing, now see some child is saying this. Hey Baba, this will also not happen. There won't be A either. Cross out A as well.

[00:38:04]Now see, some child will plant something else. Will plant something else. He will say it will be Sir D.

[00:38:10]Someone will say it must be Sir B. Brother, tell me correctly. Tell me correctly. Isn't it? Tell me one correct answer. Please tell me one correct answer. What will happen? So tell me correctly. What will happen? Yes.

[00:38:23]What will be the answer to this brother? Its answer will be B. Its answer will be B. Hey ghost, this is such a trivial question. Aunty, remember what is equal to e? dv/dr. dv/dr does not. There is also a minus sign. There is also a minus sign. You must have read this.

[00:38:36]E = how much? V/R happens. He said V means how much is it? It's volted. R means what happened? Meter done. Meter done. This is the meter. No, the meter is not on volts.

[00:38:45]What is this E? This E is the potential management temperature of this, isn't it?

[00:38:51]We call this E Equ - DV / DR. So for this we apply volts for DV. We install the volts and for DR we install the meter. Now nothing happens for minus.

[00:39:01]So what will be our correct option for this? It will be B. Isn't it?

[00:39:05]Confirmed B will happen. Now he is saying the right thing, it will be confirmed. He is already saying that it will probably be B. Maybe nothing happens, brother.

[00:39:11]Maybe you don't have to tick it. You have to put a confirm tick.

[00:39:13]Look ahead. The next question is yours. There is movement of free electrons inside the conductor.

[00:39:19]The motion of free electrons inside a conductor is that is, whether it is a conductor or not, what is the motion of free electrons inside it? Option A says uniform accelerated drifting or deaccelerated. Has it become uniform, accelerated, drifted or slowed down? Tell me brother, what will be the answer to this? Please tell me the answer to this quickly. Please tell me the answer to this. You have to remember that word.

[00:39:46]What is it like inside a clever? It is drained away.

[00:39:48]Drifting happens. Remember you read about drift velocity. Isn't it? So how is it for you inside it?

[00:39:54]Drifting is downstream. Remember, I know that if you look at the question, it will tell you that it is similar to you. Will declare him [ __ ]. Kono quick what will be the correct answer to this? The correct answer will be ours. will be drained away.

[00:40:07]Option number C will be corrected.

[00:40:13]Next look, you have solved this question, what is the commercial unit of electrical energy? The commercial unit of electrical energy is asking you. What is the commercial unit of electrical energy? I am asking you about the commercial unit of electrical energy.

[00:40:29]Option A is done, watt is done, volt is done, unit or kilowatt hour is done, joule is done. Answer this quickly and comment, child.

[00:40:48]Let's have a baby coming right. A baby 's coming right up. C is absolutely correct.

[00:40:53]Unit word is unit. The unit is kilowatt hour. You should remember that one unit will say, what is 1 unit equal to? 3.6 * 10 to the power is 6 joules.

[00:41:06]This happens. One unit is equal to this much. Isn't it? He will tell you one unit or will ask you what is the value of 1 kilo watt hour? This is what I have to tell you. 3.6 * 10 to the power of 6 joules. Ok?

[00:41:21]Remember. Its answer will be C. Absolutely absolutely fantastic.

[00:41:26]Look here it is saying 200 volts is 220 volts. Now you have to make this question and tell me. Now let's see how many children can solve this question.

[00:41:36]How many children can make this question? Let me see, what will be the resistance of a filament of 220 volts, 1000 watts, 100 watts, etc. What will be the resistance of a filament of an emf of 220 volts, 1000 watts, etc. Here is a bulb, what is its voltage, it is 220 volts, 220 volts is given, its power is given, 100 watts is given, so what do we have to find out for this filament, we need the value of resistance, the option of resistance is saying 100 ohms, 220 ohms, 484 ohms or 4840, the option is saying from here [coughing sound] means the question is saying what will be the resistance of the filaments of a 220 volt 100 watt electric bulb? Done. Please tell me the answer to this. What will be the answer to this?

[00:42:21]Asking for the resistance of the bulb.

[00:42:24]Make it quickly and show me.

[00:42:32][nasal sound] Yes. She is telling like a child. She is telling like a child.

[00:42:39][nasal sound] Tell me quickly. [nasal sound] Come on brother, there is a formula. P equals V² / what? This is R. P equals V² / R formula is ours. Brother, what are you asking me? R is asking me. the Resistance is asking. R was asking.

[00:43:01]How much will R become? V² / how much? How much did P brother V give? 220 is given. So what is the square of 220 multiplied by 220?

[00:43:12]P How much did you give? 100 watts. You can invest 100 from here. How much squared is E0 zero to E zero E 22? What is 284? C would be 22 ka aapka hota [nasal sound] 484 na. It will be 484. Yes. I said 284 for this.

[00:43:26]What happened to this option? It became C.

[00:43:28]Its option C got corrected. It will be C sir. Yes, the child is absolutely right.

[00:43:32]What will be your option for this? It will be C. This option will become your C. Well, all the children's comments are exactly like yours. Isn't it?

[00:43:38]This option will become your C. Ok? 484 will be its answer.

[00:43:44][laughter] [sound of throat clearing] I'm not feeling well. I have fever.

[00:43:52][nasal sound] Let me move on. Yes, what happened to it brother? It will be 484. Remember the formula. p = v² / r. If you make it on this formula, it will be yours.

[00:44:03]Its answer will be 484. It will be 484.

[00:44:08][nasal sound] Coming next. Look next, he is saying what is the electrical conductivity of a superconducting material? If it speaks, ask for the resistance of the superconducting material. So remember, if you asked for the resistance of a highly conducting material, we would have said zero. You should have told zero.

[00:44:28]And what is conductivity? Conductor conductivity is equal to resistivity. So its resistivity is equal to conductivity. So, conductivity is equal to resistance per unit, whatever it is, its resistance becomes 1/0. So how much is this? It became infinite. This became infinite. Isn't it? So remember this, if the resistance asks, how much will we say about it? Zero.

[00:44:51]What is the resistance of a superconducting material? It is 0.

[00:44:53]And if he asks you about conductivity, do you have to answer it brother? The answer to this will be infinite. Option number A will be correct. Okay, right? Remember this.

[00:45:04]Here it is saying that the electrical conductivity of super conducting material is, so remember what will be its answer? It will become infinite. It will become infinite. I'll move ahead.

[00:45:13]Look at the next question, what is the 26th one saying? In 26 it is being said that shunt is used in galvanometer.

[00:45:20]You know this is the objective of the fourth chapter but it is formed in electric current.

[00:45:24][Sound of clearing throat] This is our fourth chapter arrangement, where does it go brother, if it is made in electric current then it is okay. If it is possible then we will make it.

[00:45:31]Here it is said that shunt is used in a galvanometer. So why do we use shunt in galvanometer brother? So do we know why we use it? To increase its sensitivity, to protect it from high current, to increase its resistance or to increase its range, increase its sensitivity, protect it from high current, increase its resistance or decrease its range, I am saying that I am doing range, so remember the word, this shunt, what is a shunt, look carefully, this is how your galvanometer is, look what happens to you like this? What happens like this? In this way, the galvanometer here became a galvanometer. What happens in parallel to this? Shunt shunt is installed. Now what happens to this shunt? It is a low resistance.

[00:46:22]This is low resistance. There is resistance.

[00:46:24]Now tell me one thing brother. Its resistance is low. So when we pass current from here, where will more current pass from? Will pass through the shunt. And where will the low current pass? from the galvanometer. So when the current goes down it will pass through the galvanometer. So will the galvanometer in the circuit ever burn out? It will not burn. What does this mean? What will be the answer?

[00:46:44]Protect it from high current to protect it from high current. Isn't it?

[00:46:51]What do we do to protect it?

[00:46:53]What is connected in parallel to the galvanometer? The shunt is inserted. Isn't it? The shunt is inserted. Its answer board will not be A. The answer to this is what will happen to us? It will be B.

[00:47:02]Remember what will be the answer to this? It will be B. [coughing sound] [throat clearing sound] I long to meet you, I long to love you.

[00:47:12]Listen carefully here.

[00:47:17]What is added to convert a galvanometer into a voltmeter? The convert a galvanometer into a voltmeter what is connected? What is connected? Option A is saying high resistance in series. Low resistance in parallel. C is speaking low resistance in series. And D is saying high resistance resistance in parallel. That means high resistance in series. Then it is saying high resistance in parallel. C is saying low resistance in series and D is saying your high resistance in parallel.

[00:47:44]Aunty, listen carefully. Look, this is your galvanometer. What is this of yours? It is a galvanometer. If you want, the galvanometer can become a voltmeter. The voltmeter will have to be connected in series with it. You have to add. R needs to be added and what should it be? Should be high. Now what has become of you? This is your voltmeter.

[00:48:04]Volt meter. How is a voltmeter made?

[00:48:10]How is an ammeter made by connecting high resistance in series? So remember to add negligible resistance in parallel. So what do you do to convert a galvanometer into a voltmeter? So let's add high resistance in series.

[00:48:20]That means where is the category brother? So where is the high resistance?

[00:48:24]In the category. Look, search brother. High resistance occurred in the range. Option number A will be correct.

[00:48:29]Doing high resistance in a series.

[00:48:31]High resistance in series has to be done. Ok?

[00:48:34]High resistance in the range. The children are absolutely right.

[00:48:36]C sorry A will be the correct answer.

[00:48:38]Your correct answer to this will be A.

[00:48:41]Look ahead. The next question is coming, Aunty.

[00:48:46]What is connected to convert a galvanometer into an ammeter? I just said it.

[00:48:51]Connect the negligible or low resistance in parallel. Isn't it? This is your galvanometer. Connect the galvanometer and its parallel.

[00:48:58]What is this by doing this? There was less resistance. There was less resistance.

[00:49:01]What does less mean?

[00:49:05]We also call it low. This is called the following. We write it down as follows.

[00:49:09]We put resistance to it. Let's put the following. There was low resistance. Isn't it? What has happened to this ours and mine? It became an ammeter. So what will be the answer?

[00:49:17]Low resistance in parallel. In parallel. So look brother, it is parallel.

[00:49:20][sound of clearing throat] There you go.

[00:49:21]What about in parallel? Low resistance.

[00:49:24]What do we call this? Shunt speaks.

[00:49:25]This is what we call shunt.

[00:49:28]Shunt speaks. Shunt speaks.

[00:49:30]We call low resistance as shunt.

[00:49:32]Row low resistance in parallel.

[00:49:35]What brother? In which should you put the shunt?

[00:49:37]Put it in parallel. Your answer will be yours.

[00:49:45]Let's move on. The next question number one is saying yours. This is your 29th. The syllabus is a set of 35 questions which you are about to finish. I understand that you guys might be feeling a little bit like Sir ji, if you do it a little faster then there will be no problem, this is how it happens in live classes. It will take you some time.

[00:50:03]Look further, it is saying here that what is the approximate value of Faraday constant? Asking for the value of Faraday's constant.

[00:50:10]The approximate value of Faraday's constant f is 96,500 coulombs per mole. Isn't it? B is saying 96500 koolam in mole is saying. C is saying 965 coulombs per mole and D is saying 965 coulombs per mole not 9.65 coulombs per mole.

[00:50:30]So remember brothers, what will be the answer to this? Will be sold at 96500 kulam. Isn't it? You might have read it also.

[00:50:39]We must have read the value of one Faraday.

[00:50:42]It is also the largest unit of charge.

[00:50:45]Look ahead. Measured by electron volts.

[00:50:48]Whose brother? So what do you measure by electron volts? Electron volt is measure of what does electron volt measure? Is option A referring to charge, potential difference, current, or energy? Here charge is created, potential difference is created, current is created or energy is created. So brother, what will be the answer to this? Energy to energy that means energy. And speaking of electron volts, that is, one electron volt is 1.6 * 10 to the power -19 joules.

[00:51:15]You will remember this, you will remember the value of one electron volt. Ok? So what will be your option number? D will happen.

[00:51:22]Spectacular. Very good, your option D will be corrected.

[00:51:27][nasal sound] Look here, the next question is yours is what is the formula for the kinetic mobility of a charge carrier brother I am asking you for the formula for mobility.

[00:51:38]The formula for mobility of a charge carrier is so vd μ = vd * e μ = vd /e so μ becomes equal to e / vd or μ becomes equal to vd² / e so tell me the answer to this what happens to your mobility tell me quickly tell me the answer to your mobility brother [sound of clearing throat] quickly kids comment what happens to the mobility kids tell me what will happen BB and some other kids will be B confirm tell me quickly you are telling B okay it's 8:00 o'clock oh what will happen to this B will be the answer to this B its answer will be B okay your answer to this will be B come to 32 let's come to 32 and what 32 is saying is what effect does increasing the pressure on a copper wire have on its resistivity, right? Asking for resistance.

[00:52:59]As the temperature of a copper wire increases its resistivity. Option A is saying, increases, decreases, remains unchanged, becomes zero. Tell me quickly brother, tell me the answer to this. What is bore copper? Copper is a metal, right? Copper has become your metal. It became metal. Asking for its resistance.

[00:53:16]Asking for resistance. What is boredom? So watch the resistance increase. The resistance of the conductor increases but the resistivity decreases. The opposite happens. Isn't it? So what will be the answer to this? Decreases. Decrees will be the answer to this. Option number: Yes, you are telling it absolutely right, child.

[00:53:33]I'll just finish this. Then I will drop your class. I will drop his class. Isn't it? I will start it in 11th sorry 11th class. The next one is saying three resistors of 3 ohms each are connected in parallel. Their equivalent resistance is asking. He is saying, look, this has happened first.

[00:53:47]Second, this happened and third, this happened to you.

[00:53:52]What is the value of all these connected in parallel? 3 ohms is given. So asking for the value of its total resistance. So what is 1/rp? So it will be 1/3. It will be 1/3. It will be 1/3. If you do it then these three will come.

[00:54:03]It will come to three. If you cut it, one will come.

[00:54:04]How much value will you get? It will become one.

[00:54:06]One is a given. Option number C will be correct. One brother is saying everything.

[00:54:12]Where will B come from brother? Its answer should be A.

[00:54:14]What will be the answer to this? It will become C. There will be one Om.

[00:54:16]Look, in parallel, in parallel, you know how it is formed, so where does your intellect remain brother, the intellect gets distracted, come forward, come forward, yes there must be one, it is absolutely correct, now it is saying which quantity is electric current, which quantity is electric current brother, it is saying what type of physical quantity is electrical current, aunt, remember, do not discuss tension, do not take tension, whatever is your level, whatever is your level, you do not have to carry tensors in 11th-12th class.

[00:54:50]Where is tensor? You will have to understand tensor when you study after 12th.

[00:54:56]Now you should understand that tension is not for you.

[00:54:58]You don't have to understand this right now.

[00:55:00]This option is not given to you.

[00:55:01]Forget this. Forget this. All you have to do is tell me what quantity is electric current? Is it a vector quantity or a scalar quantity? What will be the answer to this? will be a scalar quantity. will be a scalar quantity.

[00:55:09]What quantity is electric current? Scalar quantity. Which option number is correct brother? B is correct. Electric current is a scalar quantity. Remember.

[00:55:19]One last question one your last question and will be finished. It is said that fuse wire is used in electrical circuit.

[00:55:28]Its because its in an electrical circuit a fuse wire is used because it has. I mean, the circuit is an electrical circuit, so why do you use fuse wire? Why do you use it brother?

[00:55:44]Say that it has a high melting point. Has a higher melting point. Tell him that it has a low melting point. Has high conductivity.

[00:55:51]None of these. High melting point, low melting point, high conductivity or none of the above? Tell me the answer to this. What will be the answer to this? The answer to this will be low melting point. Will have a low melting point. Low melting point. This will be answered. Isn't it?

[00:56:05]What is its resistance, what happens to it brother?

[00:56:07]What is the melting point of its fuse wire? The following happens. Remember, your option number is C, yours is getting corrected. No, right? Yes B your B your is getting corrected.

[00:56:17]So, my 35 objective questions are over today. So you guys stay connected to Physics Bihar like this. And the class that will be there now will be class 11th. It will be of Physics which is basic Maths. So I had said that this basic math of ours will be for the children of 11th class and also for the children of 12th class.

[00:56:38]This will be basic math for both the children and I will start the basic math class after 5 minutes. Let me also relax a little.

[00:56:44]Then I will start the class.

[00:56:46]Let's go, Jai Hind, Jai Bharat. Thank you. I will meet you in the next class.