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[00:00:15]What's coming?

[00:00:18]This kind of thing is coming. It's coming like this.

[00:00:33]Look, you guys, it is coming fine online, how is it looking, it is looking like this in it, yes, it is fine, I saw it, yes, I got tensed brother, look, after a long time today I am coming live because I was very worried for the last 15 days, my duty has now shifted from Patna, because the Electrical Engineering Department of NIT Patna has now shifted, so I was on duty in the shifting also and I was quite busy in that for the last 15 days, but now there will be regular classes, no problem.

[00:01:31][sound of clearing throat] Okay, that'll do it. It will be a very good devotional channel brother. He is saying, look listen, here first he is saying the mutual inductance between two coupled coils, first of all let me inform you that our foundation batch of SSC JE is also running, interested students can take it in offline mode as well as online mode and absolutely live classes are going on and studies are being done very well. Studies are being conducted in a systematic manner. It is a better environment.

[00:02:13]Getting good guidelines. And you should join once and see. You will feel that if you work hard, you will get the job and I will make you work hard.

[00:02:25]I will not give you the job. You will take it yourself.

[00:02:32]Let's say the mutual inductance. Come on, let's come to the question. The mutual inductance between two coupled coils is 10 milli Henry.

[00:02:44]What is the mutual inductance between the two coils?

[00:02:46]If the turns in one coil are double and that in the other are half, the mutual inductance will be See, if there are two coils, both are mutually coupled, one has number of turns n1 and the other has number of turns n, suppose this is a magnetic circuit, common magnetic flux is connected, then tell me what is the mutual inductance between the two, then μ note n1 * n2 μ note * n Don't you know? Like what is l equal to? μ note * n squared a by l in the same way a by what? l So what is ours? m directly proportional to what will you write? n1 * n2 is one doubled.

[00:03:32]One has been halved. So the mutual inductance will become constant.

[00:03:36]What will happen? It will become constant.

[00:03:39]So if it is 10 milli Henry then what will be the answer? 10 ml will be Henry. Answer is clear. Let's move on to the next question.

[00:03:47]Coming to the next question. Look, it is saying that given two coupled inductors L1 and L2, their mutual inductance M satisfies.

[00:03:58]Look, the mutual inductance between the two coils is, let us assume the coefficient of coupling between them is K. And what is the value of K? Less than equal to 1. And the formula for mutual inductance is k under root l1 * l2 and what is the value of k? less than equal to 1 then what will m become? Less than equal to under root l1 * l2 answer number will be who? Your correct answer will be D my brother. What will be the correct answer? Correct answer. You guys make it. Make it quickly. Yes, make it quickly. Now there will be regular classes.

[00:04:34][nasal sound] Let's say when two coils having self-inductance l1 and l2 are coupled through a mutual inductance m, the coefficient of coupling k, see m is equal to what k under root is l1 * l2. So your k equals to what? m by under root l1 * l2 is somewhere, can you find this, what will be the answer number, b will be its correct answer, match it, you see quickly, it is saying the overall inductance of two coils connected in series with mutual inductance with mutual inductance opposing all self inductance is l1 with mutual inductance opposing self inductance opposing both are opposite, what is the question number, question number four, there will not be one opposing, it is JB Gupta's question only, overall inductance of two coils connected in series with mutual inductance adding, self inductance adding, what is it, it is adding, it is adding. There is an edging. what is an? There is edging. That would be an edging. Both will not happen.

[00:06:05]Look, he is saying, look, listen here first.

[00:06:08]The overall inductance is saying the two inductances are in series. The two inductances are in series.

[00:06:13]What is the mutual inductance between the two? m l1 of one l2 of one sorry or let's say la of one. What about one? LB is.

[00:06:23]What will you write for L1 equal to in case of series adding? LA + LB + 2m, right? Now in the case of opposing, L2 equal to what? LA + LB - 2m. Now look, subtract both of them.

[00:06:41]Subtract both. We will reduce this in this. So what will be L1 - L2 equal to? If you subtract it, it will cancel out, right? How much will it be?

[00:06:51]4m So what is your m equal to? 1/4 l1 - l2 What will be the answer?

[00:06:59]Your answer number will be C. Both will not be opposing. There will be trouble.

[00:07:07]Understood? Yes.

[00:07:10]What is the fifth number? He is saying that two coils connected in series have equivalent inductance of 16 milli Henry and 8 milli Henry depending on their connection, see in one, 16 is coming out, what is coming out in one, he is saying that two coupled coils are connected in series, two coils are connected in series, see, they are connected in series, suppose one is LA and one is AL, what is the mutual inductance between the two, I am understanding, he is saying that two coupled coils connected in series have an equivalent inductance of 16 milli Henry and 8 milli Henry depending on their connection, depending on this connection, if one is more then there will be an adding condition, if one is less then there will be an opposing condition, then the mutual inductance m of two coils m is asking my brother, look here first, what will be the equivalent l1 equal to, tell me, then in case of adding, what will be l2, la + lb + 2m, what will be la + lb - 2m In the condition, in the opposing condition, if you did not understand then see, that is why your 4m equal to two minus two will be how much l1 - l2, so what is 4m equal to l1 equivalent to 16 - 8, that means what will be 4m equal to two, tell me how much will it be eight, it is two somewhere [sound of clearing throat] wait a minute, a little mucus has come.

[00:10:05]We are five now, it's completely five now [nasal sound] what happened, it's done. My entire throat became completely sore.

[00:10:33]Check whether the sound is going through or not.

[00:10:37]Vitas gets tired by the time he arrives. Yes. He is saying that the property of material which opposes the production of magnetic flux is known as reluctance. What do you say? They say reluctance. This is just the definition. What do you say? They say reluctance.

[00:10:53]Paramansa what happens to it? The opposite happens. Did you understand? permittivity so what is yours? There are different things. Yes, what does this represent? Represented by Epsilon.

[00:11:03]Whom do you represent? What is MMF? ni happens. Did you understand? So saying the property of material which opposes the production of magnetic flux is known as reluctance. What do you call that? They say reluctance. What's next for you? The saying is to coil to coil ound over an iron ring. A coil is not sorry to. A coil wound over an iron ring. Look, there is an iron ring. What is an iron? There is a ring.

[00:11:37]And a coil wrapped my brother. Look it is saying a coil over an iron ring. It is an iron ring. Carries a certain current. is carrying a certain current. I suppose what is the number of turns? n. Yes. Certain current and establish a flux in the ring.

[00:11:56]What is Establishing in the Ring?

[00:11:58]Flux. It is saying that if the area of ​​cross section of ring is doubled, if the area of cross section of ring is doubled, then the flux density in the core is saying that if tell me how much will it become, now look, it is saying that by doubling the area of ​​this core, like now your reluctance is equal to phi, do you know, ni / s, this is what will be generated, right? Now what will be your s equal to l / μ0 * qr * a did not understand, now look, listen here first and you know what is your b equal to a, did you understand, when your area is being doubled, then the reluctance will be halved, what will be the reluctance, and when the reluctance is halved, then the same coil will produce double the flux, same coil, same flu, now look, oh brother, when the area is halved, sorry, doubled, then the reluctance will be halved and when the reluctance is halved, then the same coil, same coil, through the same current, now double the flux will be generated, now what is your b equal to A, then the flux doubles If the area is doubled then what will happen, it will remain the same, what will happen, same edge as the previous value, same edge, not half, it will not be half, it will be the same edge, just see, it is a simple ring, what is it, it is a ring, did not understand, it is a ring and a certain current is flowing through a coil, so now the coil is the same, the number of turns is the same, only the area has been doubled, so when you double the area then the reluctance will also be half and will be half of the reluctance, so the same mmf through the same coil, now how much flux will the double flux produce. Did you understand?

[00:14:00]So the flux has doubled. What is the area? It is double only. So what will your flux density be? Same value. Did you understand? So change it. Is the answer clear? Are. Yes.

[00:14:15]This is a confusing question. Didn't understand? I did it wrong.

[00:14:21]Hey Bara [nasal sound] is saying the conductance of electrical circuit is analogous to magnetic circuit. Of Paramansa. Whose conductance? It belongs to the Permians.

[00:14:33]And whose reluctance? Of resistance.

[00:14:36]Whose flux? Of current. Relative permeability is a kind of conductivity. This is magnetic conductivity. So it will be about conductivity. Did you understand? Yes. Let us go.

[00:14:50]Ok. So this will be about conductivity.

[00:14:53]Who will it become? This will be of conductivity.

[00:14:57]No, and whose will it be? It will be about resistance.

[00:15:02]Whose is this? It will be of current. No. And whose is this? It will be about conduct, my brother. It will be about conduction. Is it clear? Yes. Let us go. It is being said that the reluctance offered by magnetic circuit depends on what the reluctance that occurs depends on? s = l / μ0 * qr * a, this is what nature tells us. What did you tell me? I found nature. This indicates the length.

[00:15:36]Got the length. Gives the cross section area.

[00:15:38]Got a. So it will depend on everyone.

[00:15:40]What will be the answer number? D will be its correct answer. D What will happen? Correct answer.

[00:15:47]Yes, the students who are watching, if any of them need the foundation course and what about you, your target batch is also going on in your live batch, you can join that also and if you need to contact then you can contact on this number, yes, for a little over 15 days, our lab was being shifted to NIT Behat, so we were busy in that and now your classes will be regularly on YouTube, so right now my duty is going up and down from Behat.

[00:16:18]We just arrived a while ago. These people are set. The session is going on now. [nasal sound] 6274 9596 Tell me what is written? So saying a cast steel electromagnet has an air gap length of 3 cm would be mm not cm. This is a question from JB Gupta. Did you understand? How much is it?

[00:16:43]3 mm is how much?

[00:16:46]0.3 mm is 0.3 mm, my brother, so how much will it be? Divide it by 1000, 0.03 will be zero, not 3 meters. I am saying find the ampere turns for the air gap to produce a flux density of flux. What is the flux density in the air gap? I am saying a cast steel electromagnet has an air gap length, this much air gap length is given. I am saying find the ampere turns for the air gap to produce a flux density.

[00:17:32]What is the flux density b given? So tell me 0.7 weber per meter square, not in the air gap. Do you know what is b equal to?

[00:17:42]μ note * h.

[00:17:45]Hey, why would you write μ r, it is an air gap, that is why your h is equal to what will be b / μ note, that means what is b? 0.8 times 4i * 10 to the power - 7. No, this is what it will be.

[00:18:02]Now see, what else is yours? Okay, now see ours. What is?

[00:18:12]Now our h is out. Now it's saying find the ampere turns. So how much is ampere turns? What happens to your ampere turns? ni equals h * l, right? Meaning, what will be the ampere turn required equal to? What is the value of h 0.7 over 4 pi times 10 to the power -7 times?

[00:18:39]0.3 so see how much will it be 7 * 3 21 no 7 * 3 how much will it be 21 times 10 to the power multiplied by seven see how much will it be 1 2 3 4 5 1 6 10 to the power -6 divided by 4π this is how much will it be your 210.

[00:19:10]What will be 210 divided by? What is four times 3.14? If you divide it, that is, 21 0 divided by 42 and 4 3 divided by 12 12 42, see what you get.

[00:19:46]Hey tell me you guys are also being great the donkey 16 nine nine is coming down okay 14 chaka 56 is 12 56 tell me how much did it come 16 7 one is 1671 there are two zeros see this is 210 and this and mm have been converted into meter how will it remain three yes okay three will remain three only we will remain three this is a mistake did not understand yes who will come equal answer do not make calculation mistake otherwise you will get beaten do not do calculation in such a way mistake came, understand and see calculation yes he is saying magnetic field intensity magnetic field intensity means he is asking at the center of circular coil what is the magnetic field intensity at the center of circular coil? h = i / 2r i b What is 2r and b equal to? μ note * i b 2r And if it is of n turns then b = μ note * ni b 2r See, it is saying the magnetic field intensity at the center of a circular coil of diameter 1 meter. If the diameter is 1 meter then what will be the radius. It is carrying a current of 2 amperes. Carrying a current of 2 amperes. Carrying 2 amperes, so the diameter is the radius. So the diameter is 2r. So what should we write in place of 2r? You can write the diameter directly. So tell me how much will it be? So what is 2/1? Two.

[00:22:48]Hey brother, this is radius. If you multiply by two, you will get dia and dia is given. So h = i / 2r. So we can also do i big.

[00:22:56]So how much will it be? How much will 2/1 become? The answer will be 2n.

[00:23:04][nasal sound] saying the field at any point on the axis of a current carrying coil will be look this is a current carrying coil. Listen, this here first is the current carrying coil. It's asking for the magnetic field on its axis. Did you understand?

[00:23:22]So here we will consider a current element. So the direction of the current element will be here. Its perpendicular. Here we will consider a current element.

[00:23:29]So if you take it out here, it will become like this.

[00:23:32]Ok? What now?

[00:23:35]You will extract two components from it. Suppose db1 will come and suppose what will come? DB2 A component here. So what? Let's say this is your theta and this is your θ1. is θ2. So db2 cos θ2 db1 cos θ1 what will come here tell me? So what will become db1 sinθ1? So tell me if db 2 sin θ2 is along the axis then both of these will cancel out. So where will it be? If this is a current carrying circular coil along its axis, then if you are asking about the magnetic field on its axis or asking about the magnetic field intensity, then it will be along its axis.

[00:24:20]These two will cancel each other out. So where will it be? Parallel to the axis at angle 45 degrees not zero. What will happen?

[00:24:34]The field at any point on the axis of a current carrying circular coil will be perpendicular to the axis. It will be wrong.

[00:24:41]What will happen? Parallel to the axis at an angle of 45 degrees will be zero. No, who will be?

[00:24:50]Answer number B parallel.

[00:24:52]Tell me what will happen? Did you understand this? Yes. We will extract it by Savart's Law. From whom will you take it out? Biots will derive it from Evert's Law.

[00:25:14]Sir in question number 10 how did we come to know that this formula will be applied? I have problem in understanding this only. This is what we understand as to how we came to know that the formula would be applied. Now you will understand only when you read it.

[00:25:37]What is the 10 number formula? Yes, yes.

[00:25:45]Who is it? He is a great fool. So asking is finding the ampere turns of the ampere turns.

[00:25:54]So tell me what is the formula of ampere turns? So what is ni equal to? h * l, so we know the length of the air gap. So h is not to be removed. So how will h write it? b = μ0 * h so we know b.

[00:26:09]e remains a given. So I took out h, multiplied it by the length and it did not come out by the gap. Who has to brainstorm?

[00:26:17]How to apply the formula, read it and then practice it, then you will come to know what is given and what is to be taken out, see it is saying that an air gap is usually inserted in magnetic circuit, so as to why air gap is inserted, as you people must have read in DC machine also, there are two main poles and the interpole is a little narrow and small, it is thin. Here more air gap is given near the interpole so that it does not saturate quickly. Saturates quickly, yes. So the job of the air gap is to prevent saturation. What will be the answer to saturation?

[00:27:05]What is the function of air gap?

[00:27:29]What is he saying, listen here first which of the following statement is correct, which statement of yours is correct, he is saying the magnetic flux inside the exciting coil is is the same as on the outer surface. For example, look, listen, here first of all this is a coil, so the magnetic field outside it or the magnetic flux density is very less as compared to the inner side. That means if you look at the outside cross section area, it is very large. If you look at the cross section area inside, it is very small.

[00:28:02]So inside the comparator is uniform inside. What happens inside?

[00:28:08]Very little happens outside. That is why when the h of a solenoid or coil is calculated, only the length of the coil is taken into account. These do not take up the entire length of the magnetic circuit. Why? Because what do you have outside? The magnetic flux density is negative compared to the inner side.

[00:28:29]So when you take the magnetizing force due to a solenoid, just take the length of the solenoid.

[00:28:37]What do you take? So it won't be the same. It will be wrong. The magnetic flux inside an exciting coil is zero. It is wrong. Is greater. There is a uniform. The magnetic flux inside the exciting coil is greater than the outside. Is greater. The magnetic flux inside the exciting coil is lower. This happens more inside. What happens? What will be the answer number?

[00:28:59]A boy has run away. It is written that question number 10 2100 will be divided by 1256 not by 12 15 121 where should we write?

[00:29:17]He is still behind. Yes 1256 is fine.

[00:29:27]Hey, sometimes mistakes happen tomorrow. If that much comes to your mind then do the multiplication properly.

[00:29:34]Say if two conductors carry current in opposite direction there will be see two conductors in opposite direction when current flows in the same direction then what is the force of attraction and when current flows in opposite direction then what is the force of repulsion what will happen here what is attraction what is attraction here what is repulsion what will be the answer here.

[00:30:09]Look what he is saying, listen here first he is saying that a straight conductor of circular cross section carries a current. One of the following statements is true. This regard he is saying that there is a straight conductor whose cross section area is circular. What is? It is circular and it is carrying current.

[00:30:30]Which of the following statements is true in this regard? Meaning, which statement is correct in this regard? No force act on the at any point? Look, when a conductor with a circular cross section carries a current, my brother, the force exerted is radial. What does the force feel like? Radial force is applied. What kind of force? Radial force is applied. Radial Force. Meaning he wants to increase its cross sectional area.

[00:31:01]What do you want to do?

[00:31:03]Wants to increase the cross section area. No force acts on the conductor at any point.

[00:31:08]Conduct force will be deployed. An axial force acts on the conductor tending to increase its length. No. What kind of force does it feel like? Radial F. A radial force acts toward the axis tending to reduce its cross section.

[00:31:25][nasal sound] No, the cross section will increase. A radial force acts away from the axis tending to increase its cross section. What will happen? Please tell me question number 14 again. It has reached 14. Yes, he is saying that inside some coil, the following statement is correct. Understand the magnetic flux or magnetic flux density inside any coil, what happens from outside? Look, listen here first. It is said that the magnetic flux inside the exciting coil is the same as on the outer surface. What's your take on the outer surface? The outer surface will be completely different. There will definitely be more under the surface. If you are asking about the outer surface then the under surface will not be much. It is saying consider the following statement. The force per unit length between two stationary parallel current carrying conductors. If you see, there are two parallel current carrying conductors.

[00:32:54]Tell me what is the force between them. If f is equal to μ0 * i1 * i2 * l by 2 d. If you do not understand then what will be the force per unit length? μ0 * i1 * i2 by 2π d. He is saying that it is inversely proportional to the separation of wire. He is asking whether it is inversely proportional to the separation of wire. It is correct that each current is proportional to the magnitude of each current.

[00:33:32]What is the proportionality of each current? It satisfies Newton's third law. It is correct that what does it do? It satisfies Newton's third law. The answer number will be d. It is unclear like this brother. He is saying that two parallel wires separated by a distance d meter carrying a current in the same direction. The magnetic field along a line running parallel to the wire and the mid way. Between them is the magnetic field along a line running parallel to the wire and midway between them is two parallel current carrying conductors. It is saying two parallel wires separated by a distance d. What is the distance between the two? D.

[00:34:24]Carrying current in the same direction.

[00:34:26]Carrying current in the same direction. Did you understand? Carrying current in the same direction.

[00:34:32]clear? Yes. The magnetic field along a line running parallel to the wire and midway between them. See. Midway is called the Neutral Zone. What is it called? It will become a neutral point. what will it be? It will become a neutral point. Didn't understand? Which point will it be? This will become the neutral point. If he is saying this then what does he say now? Depends on I e0 Depends on D Depends on. Look, this will become zero because look, here first let us assume that the current carrying conductor is A. The magnetic field around it will be like this.

[00:35:14]Take it out, it will happen.

[00:35:17]And let's say the other one is carrying current in the same direction.

[00:35:25]So look what he is doing in the middle? They are opposing each other, right? So in the middle you will have a neutral zone.

[00:35:33]What will happen to you if you are neutral? Zero. What will be the answer number? is saying the linkage flux at unit length. The linkage flux at unit length, say n/i, is called inductance. What is said? This is called linkage flux.

[00:36:05]What is the linkage flux per unit length? So do you understand inductance? It is saying that the magnetic circuit requires 100 ampere turns. How many ampere turns? So, how much is ni equal to? 800 yes to produce a quantity of flux in a magnetic circuit if its excitation has 100 turns and if its excitation coil has 100 turns and 5 ohm resistance the voltage applied between the excitation coil then turns is given g how much 100 Gu I equal to 800 mean I how much 8 ampere V equals what? How much is IR? How much is 8 * 5? 40 volts.

[00:37:02]What will be the answer number? Do n't comment. You guys should study.

[00:37:16]Let those online people comment. When will the vacancy come? We are not sitting here in the board.

[00:37:20]We are studying. You also read it. When the vacancy has to come, it will come.

[00:37:26]We don't tell that useless thing like this.

[00:37:28]The vacancy has come, subscribe. This is not the man who shouts all this. We take the batch quickly. This course is not all of this. It will come when the vacancy comes. We are not in board wood. When the notification comes, you will also know. We will also know that. Study quietly.

[00:37:48]It is not about reading and writing. Keep worrying about vacant vacancies.

[00:37:53]See V of the following statement is correct?

[00:37:57]See what happens to you? Your b is equal to two.

[00:38:00]Tell me what happens? So μ0 * h +i.

[00:38:06]and i is the intensity of magnetization, written here as m. what is written? So what will be the answer number? C.

[00:38:21]You guys should not send unnecessary messages. What will be the answer number? C [nasal sound] is saying Next is saying According to Faraday's law of electromagnetic induction an emf is induced in a conductor whenever there is a lie in a magnetic field just lying will not work. Is lie perpendicular to the magnetic field cut the magnetic flux.

[00:38:44]Yes, moves parallel to the direction of magnetic flux. Cut the magnetic flux.

[00:38:50]EMF will be induced only when the magnetic flux is cut.

[00:38:52]This is your statement of electromagnetic induction. Faraday's Law is the first statement of the law. No, what will happen?

[00:39:01]Cut the magnetic flux. It is said that the magnitude of induced emf in a coil depends on e directly proportional to diy / dt rate of change of flux linkage rate of change of linkage flux will be what? C will be your correct statement.

[00:39:24]Saying the law of electromagnetic induction. And see, if we look at the complete statement of electromagnetic induction, then e is equal to - d fi up dt which will become c this is complete if the electron asks about Faraday's law then a complete statement is understood - d / dt di / dt is given linkage flux what is given is linkage flux rate of change of linkage flux see it is saying that in all cases of electromagnetic induction an induced voltage will cause a current flow in a closed circuit in such a direction that the magnetic field which is caused by that current will oppose the change that produces the current this is the original statement of Lenz's law. What does Mane Lenz's Law say? Lenz's law states that the direction of the induced current in a conductor or coil is such that the flux produced due to it does what to the original cause? Opposes it.

[00:40:37]For example, if we look at it, suppose you have one coil. This is the coil. Understand carefully.

[00:40:48]We installed a galvanometer here.

[00:40:51]Installed a galvanometer. Look, there is a magnet here, this is the North Pole and this is the South Pole. You are bringing it closer. What are you bringing this for? Bringing it closer to this. Then the direction of the induced current will be such that it will oppose its arrival. So the opposite of coming will happen when the North Pole here and here and the North Pole here will develop when the direction of the current is like this. No because what does the right hand rule say for coils? If you hold it with four fingers in such a way that it is in the direction of the current, what will the thumb give?

[00:41:23]North Pole. So what about you? That's it.

[00:41:26]Whose statement is this? This is the statement of Lange's Law, my brother.

[00:41:34]Saying Vi law is synonyms synonyms of the occurrence of diamagnetism.

[00:41:42]Whose law is Lenz's? Lange's Law.

[00:41:46]Kago, you guys are right.

[00:41:50]Look, understand carefully. He is saying there is a constant homogeneous magnetic field. One is your Constant Homogeneous Magnetic Field. Homogenous means it is uniform.

[00:42:00]What does G homogenous mean? There is a uniform magnetic field. Let's say you're pointing in the vertical direction.

[00:42:07]Well, this is in the vertical direction. We showed it inside. This is a uniform magnetic field directed upwards. Did you understand? Saying metallic wire in the form of square is rotated about one what is your? There's your wire. It is said that a metallic wire in the form of a square is rotated about its horizontal axis. What is the horizontal axis doing about? It is rotating. Passing through the middle point of the opposite arm. The axis is passing through the middle point of the arm.

[00:42:43]The EMF generated in the natural will be sinusoidal. How will it be generated?

[00:42:49]Sinusoidal will be generated. Who will it be?

[00:42:52]Oscillatory is saying the emf induced in a coil due to relative motion of magnet is dependent on the emf induced in a coil due to relative motion of magnet is dependent on coil resistance, magnet motion, number of coil turns, pole strength of magnet. Tell me the emf induced in a coil due to relative motion of magnet is independent of coil resistance, magnet motion, number of coil turns, pole strength of magnet.

[00:43:52]The emf induced in a coil due to relative motion of magnet is independent of it.

[00:43:58]Well, we are studying dependency. What is it? It is independent of coil resistance, so it will depend on it.

[00:44:06]What is E equal to? Tell me, it is BLV sin theta, not we are saying relative motion of magnet, asking from the motion of magnet, means the coil is stationary, correct. What is a coil? There is stationery. So the coil is stationary. So what will e be equal to? l di up dt no yes the emf induce coil resistance magnet motion number of turns polar strength of magnet. It will depend on the polar strength. The flux will also depend on the number of turns of the coil magnet motion. Coil resistance at what?

[00:44:50]Who will be the answer number? A what will happen? It doesn't depend on what? Hey, it will depend on the motion of the magnet and its relative motion. He is saying that if a copper conductor is moved across a magnetic field the wire will become magnetic [sound of clearing throat] a voltage will induce in the wire a current will induce in the wire nothing will happen a copper conductor is moved across a magnetic field copper is a conductor the wire will become magnetic if it is copper then it will not be magnetic oh it is copper then it will not be magnetic this such statement is wrong. Saying there is a copper conductor. Listen here first. There is a copper conductor. There is a copper conductor. And what is happening to you? Like look this is your copper conductor. If a copper conductor is moved across a magnetic field.

[00:45:59]Moving across the magnetic field. What are you doing? Saying, The Wire Will Become Magnetic. This is copper. It cannot be magnetic.

[00:46:06]A voltage will be induced. A current will induce in the wire. Nothing current flows when it is closed. Who will be the answer? Voltage.

[00:46:20]What will be the answer? Mark this.

[00:46:27]Voltage will be induced, right? And if the path is closed then current will also flow.

[00:46:34]Hey, if the path is closed, will there be flow?

[00:46:36]Current. It is being said that when a single turn coil rotates in a uniform magnetic field, suppose this is a uniform magnetic field. There is a uniform magnetic field.

[00:46:50]Uniform and is a single turn coil. At uniform it is saying when a single turn coil rotates in uniform magnetic field at uniform speed the induced emf will be alternating, not pulsating, what will be alternating, what will be the induced emf in the coil, it will always be alternating, like what is yours, suppose in DC motor the armature is rotating with uniform speed, then brother what is yours, sorry, or take DC generator, in DC generator the armature is rotating with uniform speed, so the induced emf is alternating in the coil, but what do we get with the help of brush and commutator?

[00:47:41]DC is available. What is written, sir? If nothing has been said about the current in the copper conductor, then nothing will happen.

[00:47:48]Hey brother, listen here first. Copper is a conductor.

[00:47:57]What was the question number?

[00:47:59]29 A copper conductor is moved across a magnetic field. A copper conductor is moved across a magnetic field. This coil is not spoken. If the coil had spoken, we would have assumed it was closed. But if a simple copper is a conductor then it cannot get magnetized.

[00:48:19]Copper is a conductor. Voltage will be induced.

[00:48:21]But what will happen when the current flows? Close. So, even if the voltage is closed, EMF will be induced and even if it is open, EMF will be induced. Did you understand? So what would be the correct answer?

[00:48:34]Voltage. Even if the voltage is close to you, EMF will still be induced. Even if it is not there, your EMF will be induced. But what must happen for current to flow? It should be closed.

[00:48:46]The Principle of Dynamically Induced EMF Utilized in DC Generators.

[00:48:50]Where do you use it? DC. Here your statically induced emf here dynamically induced thermocouple works on what principle? When two junctions are made of two different metals and both are at different temperatures, then an EMF is induced between them which is called thermoemf. Who works on this principle? Thermocouple. When there is a junction of two different metals, there are different metals. These metals are different metals and the two junctions are at different temperatures, so due to the temperature difference, EMF is induced between them which is called thermoMF.

[00:49:30]Who works on this principle? Thermocouple. But this is not our question here. Saying The Principle of Dynamically Induced EMF Dynamically saying means the conductor will be in motion. What will be the conductor and magnetic field? There will be stationery. So the utilization of this principle is used in DC generator. Where does it happen?

[00:49:50]You are used in DC generator.

[00:49:52]Who will be the answer number? Here, we find the direction of statically induced EMF and dynamically induced EMF using Fleming's right hand rule. When? When the current carrying conductor is moving perpendicular to the magnetic field.

[00:50:06]When there is no current carrying then your emf force will come there we use Fleming left hand rule for dynamically induced emf for generator we use Fleming right hand rule to find its direction when your conductor moves perpendicular to the magnetic field.

[00:50:29]Transformer works on the principle of statically induced emf and to find its direction Lenz's law is used. What do you think, it is completed and our JE Foundation batch is going on.

[00:50:41]Interested students can contact us. The class is going well.

[00:50:46]Getting good guidelines. Good content is available. Thank you.

[00:50:55][sound of clearing throat] Who is it, brother? Seebeck effect? Seebeck effect information is correct. The seek effect speaks the opposite.

[00:51:17]If you don't know about the Sivek effect, don't say anything wrong.

[00:51:33]OK Contact Thomas Selby Can You Contact Us