OBJECTIVE SERIES|| CBT-2 || || DIPLOMA ACADEMY PATNA ||PINTU SIR

[00:00:17]Look, first of all what you have to do now is that we have just started the basics again, okay, so whatever you know about magnetic circuit, magnetism, electromagnetic induction in the basics, go and read it thoroughly, whatever previous shortcomings there are, you have understood them, then start electrostat, capacitor, whatever you feel that yes, we have not been able to revise this or have got this type of question wrong, then go and start practicing them, now you have given so many exams, you have gained experience, what are the shortcomings, where are we making mistakes, how come we are lagging behind by two-three marks in the result, so think about all these things, do not study blindly, study with planning, study with strategy, yes, which ones have to be kept only for revision and which ones have to be done by working hard, what is yours, that too in such a way that there is no wrong question, and no teacher will give you a job, brother, you people do not study. Whenever the exam comes, you run away home for one and a half months and leave the set.

[00:01:37]This will not happen.

[00:01:42]And first of all ban social media completely.

[00:01:45]Stop any YouTube YouTube nonsense.

[00:01:49]Stop everything on Facebook. Read quietly. Take the job. I have to do the same thing throughout my life. If he does his job, B Reels is scrolling in the Due team.

[00:02:04]Come on, it's still teenage. Just read a little, friend.

[00:02:14]This won't work.

[00:02:17]So, there will be no mistake next time, right? Yes, work hard. Don't go home yet. Come on, let's get to the question. Yes, first of all let me tell the online people that our JE Foundation batch is also running. Your target batch is also running. If you want to join online, then download Diploma Academy Patna app from Play Store and you will join JE batch. You will see all these batches there.

[00:02:44]Complete live is going on.

[00:02:47]Live runs in Subal. Complete live recorded lectures older than 5 years or 7 years will not be available.

[00:02:52]Complete fresh video is playing live.

[00:02:56]So let us come to the question. It is said that a magnet is kept in the medium of air. There is a magnet, listen here first.

[00:03:04]A magnet north pole south pole is placed in the air.

[00:03:06]Surrounded by an iron ring.

[00:03:09]An iron ring has an iron ring around it.

[00:03:12]Ok? Iron Ring The magnetic lines of force from the magnet will be very small in the iron ring. Tell me which ring is it?

[00:03:22]So is the Iron Ring. So the permeability of iron is very high. What happens? It happens a lot.

[00:03:27]The magnetic lines of force from the magnet will be very small in the cored ring. That's correct.

[00:03:34]What will happen in the ring? It will become cored.

[00:03:36]Its permeability is very high. Therefore the magnetic lines of force will come very close to each other here. Did you understand?

[00:03:43]Because it has iron, it will offer low reluctance.

[00:03:46]Therefore the magnetic lines of force will become curved here. Did you understand? Yes.

[00:03:50]What will be the answer? Answer number B will be its correct answer. clear?

[00:03:59]Which of the following is the correct value of magnetic permeability in free space? Asking for free space. Meaning he is asking the value of the μ note. What will happen? μ Note. What is its unit? What is a Henry per meter? Henry to the meter is 4 pi * 10 to the power -7 Henry to the meter. What will be the answer? C will be the answer. Did you understand? Will there be an answer? C Yes, what is it brother? Say. Hello Sir. Please tell me sir.

[00:04:36]D K Gupta ji. Yes Gupta ji, where are you now? A, he is in BARC, Gupta ji is in BARC.

[00:04:45]Absolute permeability of free space is equal to absolute permeability.

[00:04:50]Tell me what is it? So it will not be seven. It wo n't be seven. It won't be 4 pies. 4 divided by pie will not. 4 pi * 10 to the power -7 henry to the meter. clear?

[00:05:06]Look next. Next question is saying the ratio of flux density produced by a material to the let's say a material the ratio of flux the ratio of flux density produced in a material to the flux density produced in a vacuum let's say a vacuum what is your? B is VQ by the same magnetizing force, same magnet is non-age, so B, B material, B, what is μR, what is relative permeability, did you understand relative permeability, see like this, if B is material then what will you write, B material equal to what will you write, μ note * μR * H, what will you write in vacuum, tell me, you will write μ note * H, find the ratio of these two, what will be B material divided by B, what will be vacuum? What will be μ note * μ r * h divided by? μ Note H is the same magnetizing force. This will be cancelled.

[00:06:02]What will happen? This will avoid relative permeability. What will happen?

[00:06:06]Relative permeability.

[00:06:10][nasal noise] Got it? What do you call that?

[00:06:18]Relative permeability. It is saying unit of magnetic flux.

[00:06:25]What is the unit of magnetic flux?

[00:06:27]Weber. What happens? Weber. Yes. Ampere turn is the unit of what? MMF.

[00:06:36]Hey Ampere turn an I. What is a meter squared per Weber? Magnetic flux density. Whose is the coolum? It is of charge.

[00:06:44]Whose does it happen to? It is of charge.

[00:06:48]State the SI unit of magnetic flux.

[00:06:51]Weber, is this two repeats? It is saying magnetic flux per unit area. The magnetic flux per unit area is called B. What do you say?

[00:07:03]Magnetic flux density. What do you say? It is called magnetic flux density.

[00:07:07]What do you say? Magnetic flux density. He is saying that magnetic flux density is also non-zero, tell me. Not reluctance, not reactivity, not permus, magnetic induction. What do you say? It is called magnetic induction. What do you say?

[00:07:28]Magnetic induction. It is saying magnetic flux through any close surface. What is the magnetic flux through any closed surface? This is called Gauss's law in magnetism. The close integral of b.

[00:07:44]DA = 0. What happens? 0 Print this, what will be the magnetic flux answer number?

[00:07:58]C Yes Magnetic flux through any close surface What will happen? Zero This is called low gas line magnetism.

[00:08:09]What will be the close integral of b.da equal to? 0 Print this.

[00:08:31]What is the SI unit of magnetic flux density? Weber Tesla and what is this? Weber per meter square. Weber per meter square. Did you understand? Henry is the unit of what? of inductance. Whose? It is the unit of inductance, right? Whose is Coolum? Weber of charge is that of magnetic flux. Who? The unit of magnetic flux is.

[00:08:57]Saying The Mathematical Expression of Magnetic Permeability.

[00:09:01]What is the mathematical expression of magnetic permeability? Listen. What is magnetic b equal to here? not μ * h. So b/h is equal to what? μ Who is matching?

[00:09:14]What will be the answer number? B. You guys should also publish it online brothers.

[00:09:22]Today I have been the whole question in JB Gupta. I have seen all the questions of JB Gupta today.

[00:09:32]Thank you Suraj. Very good.

[00:09:37]Work hard. Work hard. Hey brother, if you have to get a job then why do you have to study hard? Work so hard. Work so hard that in the next 6 months you see yourself as a junior engineer.

[00:09:51]Think about it, if you don't study, if you study somehow, if you study carelessly, then you know it will take 5 years, 5 years and it may be possible that it will happen in all five years or not, think about it and right now whatever job a junior engineer has, it is not less than level six. No less than level six. As of today, if you join at level six, your starting salary will be Rs 68,000 plus.

[00:10:22]Unit two hundred thousand two 68000 plus 17000, suppose 7000 and you will join the job in the eighth pay commission. The eighth page is effective from January 1, 2026.

[00:10:38]Bihar also implements it in the Central Government. If the Central implements it then this also implements it.

[00:10:43]Arrears are found by adding. So now, right now, if you assume it is 7 lakhs, then assume it is 70 thousand, then by the year 84, by the year 84, that means assume it is 8 lakhs only, yes, 8 lakhs annually for 5 years, if you do not work then there is a loss of 40 lakhs. It is only 40 lakhs, the house can be built for 40 lakhs. I am telling this to you people also. And he is enjoying it a lot, you are a big fool.

[00:11:16]Sometimes the bat breaks the horse of the game.

[00:11:18]Sometimes he breaks his head. Your story is different.

[00:11:23]And go and play football. Right now the FIFA World Cup final is between Argentina and Spain.

[00:11:30]Who is the defending champion?

[00:11:35]Argentina. Yes good. Okay, if you read it then friend, if you want to contact us then you can contact us, our number is very simple, add two zeros to 62, write 95 after 74 and add nine and six after that, this is our contact number, contact us after class work, magnetic field strength is quantified in terms of magnet field strength, h is the force acting on the unit north pole, what will be the unit north pole, newton per weber, newton per weber, millerale, which is yes and what is h equal to, ni force means ampere turn per meter and somewhere millerale, no, yes, it will be, no, what will be, tell me, yes, magnetic field strength, it is also called magnetic field intensity. What do you say or magnetic intensity?

[00:12:45]Which of the following is the SI unit of magnetic field strength? Weber will not be there. Neither will Tesla. There will not be an ampere meter either. There is no Tesla Erm on the Ampere. Yes, it will be nun.

[00:12:59]What will happen to this? Eram is nobody.

[00:13:05]It seems a mistake has been made.

[00:13:19]Which of the following is the SI exam is none. Ok? Yes.

[00:13:26]What is the relation between magnetic flux density B and magnetic field strength H? What is the relation between B and H? What is B = μ * H now? Permeability is absolute permeability of any medium, so who will it be? This is not it. Who will it be?

[00:13:47]Oh, tomorrow it was magnetism, the day after tomorrow it was magnetism. Ok? Then we turn it into an electrostatic capacitor. Once again, basic complete. I have already done it once. I am doing it again. If you make any mistake, we will break your bones, you fool.

[00:14:11]You Gandhiji, you are a guested fool.

[00:14:21][laughter] Kochi said he only eats 15 cow rotis. Tell.

[00:14:26][laughter] Hey, when will you read it? We know that whatever needs to be beaten, we will beat it. Whatever donation we want to take, we will take it from here only.

[00:14:37]Till date, I have not given any card for marriage that you will give it, if he is saying that you will give it, then we will give it, see here first he is saying the unit of magnetic field intensity, look at magnetic field intensity, he is saying magnetic field intensity, means h is equal to what is the force acting on the unit north pole, what will happen to Newton, it is matching, no h is equal to one more, ni by l, so what is ni, ampere turn per meter, is it matching somewhere, yes it is matching, then this is what we will hit, do both of them hit or not, if both of them hit, he is saying choose the correct relation between magnetic flux density B and magnetic field strength H in a material with absolute permeability mu, this will be wrong.

[00:15:45]This is also wrong. This is also wrong. Who will it be? B = μ * H Yes and numerical arrived. It is saying that the flux of 2 milli weber is how much. The flux of 2 * 10 to the power - 3 weber passes through a strip of length and breadth. The length is given as 10 cm. The breadth is 20 cm. Respectively, it is placed at an angle of 30° in the direction of a uniform magnetic field. What is the magnetic flux density in Tesla?

[00:16:32]Tell me, what will be this area equal to? Tell me, what will you find out? It means 20 cm, that is, 10 divided by 100 times 20 divided by 100. Hey, if you convert everything into meters, then what will be it?

[00:16:55]Subtract 2 from 2 and what will be it? 0.02 meter square.

[00:17:05]Saying what is the magnetic flux density in Tesla?

[00:17:11]How much is the at angle off?

[00:17:17]Saying the flux of 2 milliWeber passes through a strip of n breadth in centimeters respectively. It is placed at an angle of 30° to the direction of the uniform magnetic field.

[00:17:30]This is a uniform magnetic field. That's it. Isn't it?

[00:17:38]It is place at 30 degrees. At what degree is it placed? Placed at 30 degrees.

[00:17:44]What is the magnetic flux density in Tesla?

[00:17:54]What is be equal to? Equal to what?

[00:17:59]What is B a sine theta sine 30 degrees going to be? Twice or equal to two, sorry twice, see, we had told you, so see, equal to, suppose the area is a, this is the magnetic flux density, then what will you write equal to? BA sin theta, so look at yours, how much is phi given, how much is 2 * 10 to the power of -3, how much is b given, no, this area is given, this area is given, the area is given, so how much is the area, how much will 0.02 times 2 be, the value of sin 30 is this, it gets cancelled, that means how much will yours be, hey brother, A B is given, isn't it 0.02 * 1/2, this will get cancelled, that means how much will 2 g 10 to the power minus three equal to be, b divided by 100, so how much will b equal to be, it is not 0.2, it is not there anywhere, yes, make this, so what is your question?

[00:19:50]How much have you guys brought?

[00:20:13]We wait a little bit.

[00:20:20]A flux of two milliweber passes through a strip of length passes through a strip of length and breadth.

[00:20:34]It is placed at an angle of 30 degrees to the direction of the uniform magnetic field? What is the magnetic flux density in Tesla?

[00:21:05]Well, we can take it out like this also.

[00:21:11]Look here first, what is yours? Phi and this is your scalar quantity. Which quantity is it?

[00:21:19]Scalar quantity. I had told you two formulas there. Like suppose what is yours or what is this yours? This is some area.

[00:21:27]Who is this? There is area. And the direction of the area is perpendicular to its surface.

[00:21:33]What happens to its surface? It is perpendicular. And what do you think is yours? You have a magnetic field. This is your area direction. Suppose the direction of the area is. What is the area vector, this flux density, this angle between the two?

[00:21:48]is theta. Then understand what is yours? The flux passing through this area will be b.A. What will happen? b.A means equal to what will happen to you? ba cos theta. What is ba cos theta and where theta? is the angle between the magnetic field and the area vector. is the angle between the magnetic field and the area vector. And we had told you one by one that this is a magnetic field and what is this coil of yours? Your theta is placed at an angle. At what angle is it placed at theta angle.

[00:22:22]Then in that condition we had told one thing that your ba sin theta was mentioned there. No = ba sin theta what you mean there is that theta which is the coil which is placed at theta angle with the magnetic field. But here also it is saying that a flux of 2 milli Weber passes through a strip of length and breadth 10 cm and 20 cm respectively. It is placed at an angle [laughs] of 30°. But here it is saying that it is placed at 30°.

[00:22:57]If the question is made on this formula then it is wrong. Didn't you understand that?

[00:23:03]If a question has been made on this formula and an option has been given then it is wrong. Here it is saying that your strip has been placed at 30°.

[00:23:11]So the strip itself is placed at 30°. Did n't understand? You feel that he has made it using this formula. Whereas we use this formula then. This is the angle between your area vector and the magnetic field magnetic flux density.

[00:23:26]Then we write β = ba cos theta. And this is what we use when a coil when a coil here is not the angle between the area vector that a coil or a conductor is placed at theta angle with the magnetic field.

[00:23:41]When we taught you the theory, we would have explained it with both the formulas. You must have told this also.

[00:23:45]When will you use this? When will you use this? You must have told both. Let's see if it works on this formula or not. Look at this formula.

[00:23:55]How much of our area has come? Tell me, how much is your 0.02 square meter?

[00:24:03]How much is 2 * 10 to the power of -3b? Don't know. How much is it?

[00:24:09]What is the value of 0.02 and cos 30? Yes 3/2 this will cancel out right so how much will it be if 100 comes down then how much will it be two times 10 to the power minus three times how much will it be how much will it be divided by 100 how much will it be if you calculate 0.2 divided by root three then what did you get option B option right but what is yours right, this is the wrong option given here it is saying that the strip is placed at theta angle with the magnetic field if you did not understand then it will be made by this formula no the option given is wrong understand this yes it is saying that the magnetic field strength at a point distance r meter from a pole is tell me so what will happen it is saying look at the magnetic field, what is the magnetic field strength h equal to, tell me it is one by 4 pi μ note * μ rm by r² this is right yes means h is inversely proportional to what is r² it is saying that the magnetic field strength at a point distance r meter from a pole suppose that this is the pole strength is m at a distance r from it, asking about the magnetic field strength, then h = 1/4π μ0 * um by what will be r², so why will it be inversely proportional to the square of r, it will be r, did not understand, what will be the answer?

[00:26:15]Saying is the SI unit of intensity of magnetization.

[00:26:19]What is intensity of magnetization? I Magnetic moment Magnetic moment developed per unit volume of magnetic material. The magnetic moment developed on unit volume of magnetic material is called intensity of magnetization. What happens to this? Yes, sir, what will happen to this? What will it become? The meter cube will be cancelled. What will happen? Baber yes wait wait. If it hasn't arrived. Didn't you come? Yes. So now listen here first.

[00:27:00]What about you now? of pole strength. You listen here first. The second question is what is intensity of magnetization? I equal to magnetic moment developed magnetic moment developed per unit volume. So what is magnetic moment? What will be the pole strength in magnetic length A divided by?

[00:27:20]Area * L Got it? Yes. So what will happen to you now? Or the area will become * A. A will be cancelled. So pole strength developed per unit area. Pole strength developed per unit area is also called intensity of magnetization. Now the unit of pole strength is ampere meter. What happens? Its unit is ampere meter. What will happen to it?

[00:27:45]Meter Square. What will happen to you meter by meter? Cancelled. Ampere per meter.

[00:27:52]Who will be the answer to the ampere? If it is not available here then it will be available here only. Hey, it will be meter square on Weber. It is not matching here.

[00:28:02]Then from here we will find out that magnetic moment developed per unit volume is called intensity of magnetization. Pole Strength in Magnetic Length. Cross section area of magnet in magnetic length. A will be cancelled.

[00:28:15]So what will you call this now? Pole strength developed per unit area is called intensity of magnetization.

[00:28:22]What is the unit of pole strength? Ampere meter what will happen to this? Meter square meter to meter canceled out. Meter on ampere understood? clear? Yes.

[00:28:34][coughing sound] [throat clearing sound] Next, he's saying, what is the intensity of magnetization?

[00:28:40]Intensity of magnetization in ampere per meter of a magnet when the pole strength of magnet is Pole strength has been given to me brother. How much is m given? 50 ampere meter and the pole area of ​​magnet is what is the pole area? Cross section 0.5 meter square. So what is the intensity of magnetization I equal to? m / a how much? 50 over 0.5 is not 100. It is saying determine the intensity of magnetization of a magnet when its pole strength is 100 milli weber and has a pole area that is the question yes so what is your intensity of magnetization by a how much is g 100 and how much area will it be 70 cancel 10 bash something. It is saying that when the current through the coil of an electromagnet reverses, when the current through the coil of an electromagnet reverses, for example, suppose you have an electromagnet, it is an electromagnet, okay, right now the current is flowing in this direction, then this will be the north pole, because if you apply the right hand rule for any coil, then four fingers are in the direction of the current, then the thumb will give the north pole.

[00:30:38]Now my brother is saying that the direction of the current has reversed.

[00:30:43]What is the direction of the current? The reverse has happened. The direction of low current reversed.

[00:30:50]So what will happen now? NA North and NA South. Now let's read the options. Magnetic Field Expands, Magnetic Field Collapses, Direction of Magnetic Field Reverses, Direction of Magnetic Field Remains Unchanged. Tell me what will happen?

[00:31:10]What will happen? Will be done. What will be the answer?

[00:31:19]What is a C question?

[00:31:46]What scene will happen? Is the reverse clear? is saying what is the value of magnetic vector potential due to an infinitely small current element evaluated at an infinite distance from it?

[00:32:21]What is the value of magnetic vector potential due to an infinitely small current element evaluated at infinite distance from it, it is saying what is the value of magnetic vector potential due to an infinitely small current element evaluated at infinite distance from it, tell me what is number 23, it is saying what is the value of magnetic vector potential due to an infinitely small current element, see, you understood it, according to Biot-Savart law, what is db equal to, db equal to μ note by 4 pi i dl sine theta by r², this is what it is saying, what is the value of magnetic vector potential due to an infinitely small current element, this is the magnetic field due to the current element. μ note by 4 pi idl sine theta by r² So at infinite distance asking r when it becomes infinite what will it become zero what will it become zero answer what will it become c okay?

[00:34:57]So look at what your Biot-Savart law says about a current element? Like any As, let's say your position vector is R. The position vector is R. P is the point. This is one of your current elements. IDL IDL is a current carrying conductor. Its small length is DL and the product of current becomes a current element. The current element is basically a vector quantity. What is? Yes.

[00:35:24]So its direction is along its tangent.

[00:35:27]What is the angle? Theta. So what is the magnetic field DB that will be created here due to this current element? Do you know what directly proportional to is? Are? Directly proportional to what happens to you? There is current.

[00:35:40]DB is directly proportional to your DL. The current is proportional to the length of the element. Did you understand? Yes. And what about you? This is the current element of the position vector.

[00:35:54]What happens to the angle of the sine of this? It is directly proportional. What is db inversely proportional to? r². Did you understand? If you add them all together, db is equal to μ0/4πl sin theta / r². If you want to write this in vector form, you can do so.

[00:36:12]So what will happen? μ note / 4π μ note / 4π Take out the current. Didn't understand? What will you write as current? Take out the current. Yes. Write out the current.

[00:36:26]dl cross r dl cross r divided by what?

[00:36:34]Why would you write r*ncap in sorry ncap? This will be written in vector form. Did you understand? So see what will happen to you?

[00:36:43]When you remove it, r will cancel out to r. This is done in vector form.

[00:36:48]In what form did this Biot Savat Law take?

[00:36:50]Done in vector form. If seen directly, you can write like this also. clear? μ0/4l sin theta / r² What form is this? In vector form.

[00:37:02]So what will happen? This is zero. is saying which of the following laws state that the line integral of magnetic field intensity around a closed path is equal to the total current linked by the contour. Look, listen here, first what does Ampere's circuital law say?

[00:37:25]What does Ampere's circuital law say? The work done by a unit north pole in one revolution of a closed path h * dr h * dr is equal to total ampere turns included by that path. This is called Ampere's circuital law. Who says? This is Ampere's circuital law. Who is it? Ampere's circuital law. Ampere's circuital law. This is what the circuital law says. It is saying that the work done by the unit North Pole in completing one revolution of a closed path is the work done by that closed path and what is the ampere turn involved in that closed path? It is equal. The same states which of the following laws state that the line integral of magnetic field intensity around a closed path is equal to the total current linked by the contour. This is what he is saying, who will become? Ampere's Circuit Law.

[00:38:35]Write down Ampere's circuit law.

[00:38:41]Ok, good. We will give you the option to print the question.

[00:39:07]Tell me who will this be?

[00:39:15]Tell me who will it be? Are?

[00:39:20]See what he says, listen here first.

[00:39:23]We just explained Ampere's circuital law, H in Dr equal to what? ni no how much this total what is your ampere turn? Total ampere turns. What is? total.

[00:39:40]Now see, tell me what is b equal to, so μ note * h μ note * I am not able to understand μ note * h then what will you find out equal to h, tell me put v by μ note, what will it be, v divided by μ note * dl equal to what will be the total ampere turn, so what will be b equal to what will be?

[00:40:12]What will become of BD equal to? μ Note * ni This is called total ampere turn. What are you saying? Total So what will we use sigma summation for total? Sigma summation. So tell me who is it? Are? This will not happen. h² It will not come. i² will not come. Who will come? i Hey, you will put sigma in total ampere turn, right? Who will be the answer?

[00:40:49]The magnetic flux density look here first saying the magnetic flux density created by an infinitely long conductor carrying a current I at a radial distance R is an infinitely long conductor.

[00:41:04]is an infinitely long conductor.

[00:41:08]How far is it at a distance R from it?

[00:41:12]You have a point P at a distance R. It is saying the magnetic flux density created by an infinitely long conductor carrying current.

[00:41:20]How much current is it carrying brother? I is carrying current. How far away? At a distance R. The conductor carrying current I at a radial distance R is. So look he is asking here.

[00:41:32]So what will happen to you here?

[00:41:35]What is h equal to? i b 2 pi r no and what is b equal to? μ Note * H then B equal to what to remove? μ Note * What will be the value of h i b 2 pi r?

[00:41:54]μ Note * I B 2 R Biot-Savart law is a general modification. Now tell whose law is Ampere's law. The following is the correct expression for Biot-Savart law.

[00:42:31]We just told you about the current due to a current element.

[00:42:35]Suppose there is a current element, how much idl current is going through it? i are.

[00:42:43]What is this position vector? r someone this is the direction of your current element.

[00:42:49]How much is the angle? Theta. So what happens to you? Due to this current element, μ note by 4 pi i dl sin theta by r² means dv is directly proportional to what will happen, tell me then what will happen i dl sin theta upon there is no water.

[00:43:32]Look, is there a water bottle there? Are? Not there.

[00:43:39]No, it is an empty bottle. Bora is saying something.

[00:43:53]Look, it is saying that for a current element ideally situated at an arbitrary point, the magnetic vector potential a equals it is saying that for a current element ideally situated at an arbitrary point, the magnetic vector potential a at any point means DB is asking that potential a equals r is the distance from the observation point from the center of the current element. So, tell me what do you understand directly because of the current element.

[00:44:42]Suppose there is a current element, suppose this is the current element. Suppose this is the observation point, suppose at what distance here it is saying that for a current element idl, this is the idl.

[00:45:08]At an arbitrary point, the magnetic vector potential a equals R is the distance from the observation point from the center of the current element. Suppose you are observing from here, then how much will it be? Suppose this is the current element. Let's take direction A. How many degrees is the angle? 90 degrees. So what is db equal to?

[00:45:34]μ note by 4 pi i dl sine 90 by r square does not mean μ note by four pi how much will it be i in dl Upon it is written somewhere it is saying for a current element idl situated at an arbitrary point means how much is any current element at any one independent point? idl is saying that idl is saying that the magnetic potential vector a is equal to the distance from the observation point. It is saying that suppose there is an observation point a which is at what distance r from it, then what will be db tell me μ note by now tell me what is yours, suppose this current element is straight, if you take its tangential then its direction will be like this, how many degrees, 90 degrees, then db = μ note by four pi idl sine 90 degrees by r² is saying that the magnitude of magnetic field strength h is independent of see, so if it is saying that the magnitude of magnetic field strength h is equal to how much is h equal to if seen then ni up l this is your first formula h equal to what one by 4 pi μ note in μ rm by r square no now it is saying that it depends on what only current distance permeability of medium both current and distance tell me the Magnitude of magnetic field strength H is independent of, well if you are asking independent then it is depending on the current.

[00:48:46]Depends on the distance. It depends on both current and distance. No, the permeability of the medium is also dependent on independent permeability only.

[00:49:01]No, it is depending. Hey, permeability is coming here, right? This is the magnitude of magnetic field strength H independent of which it is also dependent on the current. It also depends on the distance. The permeability of medium only is depending on that also.

[00:49:38]Tell me what will you kill?

[00:49:45]The magnitude of magnetic field strength H is independent of HO. If h equal to if we remove it, suppose due to a straight conductor at some distance. Ok? So tell me what do you take out? So I B 2 R is the current and distance but your permeability is not known, what will be the force at the centre due to any circular coil. I B R I B is the current and distance but your permeability is not known. But if we look at this formula then permeability is also coming. But if we look at the current carrying conductor or current carrying coil then there is a permeability gap. So it depends only on the current.

[00:50:36]Depends on the distance. There is a permeability gap. So who will be the answer?

[00:50:40]C will be the answer here. Did you understand?

[00:50:48]What is the magnetic flux density at a distance R due to a long conductor carrying current I? One is your long conductor. What is? Teri K is a long conductor carrying current I.

[00:51:04]Asking R at a distance from it.

[00:51:08]Magnetic field intensity g is asking for magnetic flux density. So what is H? I / 2E R So if you take out B equal to then it will be multiplied by μ.

[00:51:21]μ Note * What will be i by 2 pi r if you calculate it in medium then μ Note * μ r in i by 2 pi r means what will be μ * i by 2 pi r answer what will be d print we are saying solid cylindrical conductor is a solid cylindrical conductor. Listen here first. is a solid silica conductor.

[00:52:12]How much current is it carrying? I solid cylindrical conductor radius R is my brother. What is the radius? It is R. The radius is R. Carrying current I has uniform current density. The current density is uniform.

[00:52:35]Let the magnetic field intensity H inside the conductor at a radial distance R be its cross sectional area A. So this will be your r. what will it be? r So if you calculate the magnetic field intensity equal to H, how much will it be?

[00:52:55]Don't understand i / 2πr here? But he is telling us that he is asking inside it. Asking inside it.

[00:53:03]How far away? at a distance r. Otherwise, see, we can take it out directly.

[00:53:10]How far is r at a distance? Are.

[00:53:14]i b 2 pi r Don't understand? So how much will it be at a small distance r? Are.

[00:53:23]What will be I * R divided by 2 = R * R? Did I * R / 2 Pi R² come up somewhere? Who will it be? I * R Do you guys know this? Must have taught in power system. Where would you have taught in power systems? When teaching internal linkage flux. Must have taught there. When we were deriving the formula for inductance of a conductor in a transmission line, then internal linkage flux and external linkage flux must have been mentioned there. So, in internal linkage flux, we must have derived something like this, then what will be the answer, I * R / 2π R²?

[00:54:10][nasal sound] saying calculate the flux density at a distance. Calculate the flux density at a distance of 5 cm from a long straight circular conductor carrying a current of 250 amperes and placed in air. There is a long straight circular conductor.

[00:54:44]Calculate the flux density at a distance of 5 cm. It is 5 centimeters. Meaning 5 b 100 meters not carrying a current of 250 amperes. How many amperes? Carrying 250 amperes.

[00:55:02]What is the flux density flux? B equal to μ Note * i by 2 pi r yhi na g Calculate the flux density at a distance of 5 cm from a long straight circular conductor circular conductor means the cross section area is circular r a long straight yhi na g circular conductor means the cross section area is circular carrying a current of 250 amperes how many amperes is it carrying? 250 amperes and placed in air. So B = μ note * i B 2πr So how much is μ note?

[00:55:45]What is 4 pi * 10 to the power -7 i?

[00:55:51]How much is 250? Ji2ai how much is this? How much is r? 5 vs 100 will not be cancelled, right? So 2 * 250 becomes 500 and this two will come up no and how much will it become by dividing it by five and how much will it become by 10 to the power-7 this five to the five will cancel out so four zeros will be subtracted by 10 to the power-3 answer which will become C you guys have got it wrong till now you are saying a circular conductor carries a current of 1 ampere having radius R meter then magnetizing force at the center of coil is given by see what is your circular conductor if a circular conductor carries a current of suppose 1 ampere carrying radius R meter then magnetizing force at the center of coil the magnetizing force at the center of this coil is I by 2r I which will become I by ampere turn unit look carefully this is also the same but ampere turn per weber this will be no what will become how much time has it become?

[00:58:00]We are 833 correct. This will be the last question.

[00:58:08]Say a long straight wire carries a current I = 10 amperes at what distance is the magnetic field H equal to yours?

[00:58:18]meter at 1 ampere. Look, here first there is a straight long conductor, at what distance from it is yours, what is the value of h at that distance, i b 2i r, so it is saying that at what distance is yours, if the meter is on 1 ampere then what is the equivalent current, yes, if you are finding out the distance of 10 ampere then what will be the value of 2i times r, otherwise if you find out R then what will be the value? Are?

[00:58:56]Hey, there is one. This is 10 Delays. If you are asking how far, then this is what I am asking.

[00:59:03]So, if you take out r, how much will it be?

[00:59:07]10 divided by 2 means r will be equal to what?

[00:59:11]10/2π makes complete magnetism happen.

[00:59:34]Look, basic is such a thing that if you do it well then what will happen to you in any exam, if you take basic circuit network or this magnet portion or electrostatic capacitor portion, you don't understand, if you try mixing all these then there will be 20 plus questions, if you don't know then if you make a mistake in this then it is very painful.

[01:00:08]You guys are passed out.

[01:00:11]If a passed out student is making all these mistakes then he is not in the news, brother. Then forget about your job. The student is studying for 121 hours to get a job. And you are thinking that you have finished studying in three-four hours.

[01:00:25]That is not possible. If you want to get a job, study. If you don't want to take it then leave it and go to Patna.

[01:00:35]Both time and money will be saved. During that time, go to the village and play cricket.

[01:00:43]Look, I have broken my hands and legs.

[01:00:47]How much was the cow cut? Do n't show me that eight paise. Eight rupees were deducted, seven sacks were lying, so why did you say one thing, seven rupees were deducted, Kochis went to play in Pataliputra ground and this Kacharwa behind Sai temple in Patna 13 was throwing me, hey why are you taking the sack and now there is a place to play cricket, yes yes now I will go to Energy Park.

[01:01:28]Go and play at Boring Road intersection. You say such amazing things that you will play cricket in Bora Park. Go and play at Boring Road intersection.

[01:01:48]Go tomorrow complete now magnetism complete