Hey, hello everyone. Welcome to our series of one shot. Right, it's a shot. You have had capsules, now it's time for a shot. So, hey, am I clearly audible and visible?
First of all, let's just clear it out. Hi, Yashar, good evening. Janhvi, Lassiya, news creators, hello. I'm good, how are you? So I think you all got to know what the surprise was, huh?
Hey Papiya, Fenil, hello, Suresh, alright. Sir, Ma'am, sir, Menti is not there today. Hey Nikesh, good evening. Today, it's more like, you know, it's like a marathon. Not like a marathon, I would say.
You have been doing the marathon, today it's like a sprint. This is a one-shot session. People who have missed the starting sessions for magnetic effect of electric current, don't worry, it's there.
People who are waiting for the next phase or the next content for magnetic effect, it's also there, so don't worry. Alright, yes, hey Aishwarya, Sai, Disha, Beckham, nice, nice name. Alright, yes. Haha, did you recognize me?
Yes, alright. Hahaha, yes, yes. Not the vaccine shots, steady shots.
Alright, so, guys. I'm clearly audible and visible, which you have given me a thumbs up. My name is Saurabh Sumesh. And yes, let's start, right?
Let's start revising people who have studied this. Let's revise people who are, you know, learning this for the first time. Learn this properly, you know, because this is one of the most important chapter. When you go forward in 11th, 12th, this is the chapter will trouble you the most.
And it's the most exciting as well, right? So don't worry. It's very important. let's learn properly and let's begin let's begin with the start the start was sumesh i think i told this right the start was hans christian's oysters breakthrough right he found what happened come on you remember the story right he was doing an experiment haven't studied it's okay don't worry you'll do it so what happened suddenly when he passed current through a wire a compass kept near to it started showing deflection which means previously people used to believe current is different, magnetism is different but no they are related. A current carrying wire shows magnetic behaviour also.
Yes Alright, okay guys focus, focus, come on. So, a current carrying wire acts as a magnet and electric current produces magnetic field. This is our understanding till now, alright.
Okay, I'll just run through this a little quickly, fine. So, just be with me, keep answering whatever you can. Yes, Disha, correct.
So, properties of magnetic field lines, guys come on, this is very easy. Just let me know. First, first property is... direction.
It is directed from north to south pole outside the magnet but it doesn't mean in between there's nothing. These are, these are, close look, come on you know this, and from south to north pole inside the magnet right? Yes? Thank you Knight Rider. Alright, next.
Magnetic field lines form continuous closed curves. This is important right? This question has been asked multiple times in true-false or in some other manner but this is important alright? Okay, degree of closeness of lines to mind, the strength of magnetic field, this is also important right, how close the lines are, it shows how strong the magnetic field strength is there right at that particular point, correct? Yes, very good, I can see some answers, nice answers, very good.
Guys come on, keep answering, keep answering. And no two field lines intersect each other. It's not possible, right?
If they are intersecting, this means that point is showing two directions, which is not possible, right? That's why they don't intersect. That's first learning. Now, let's start. Let's start with...
Nice panel. It's a nice short form. Yes, come on. Magnet field due to straight current carrying conductor.
You know everything. Guys, come on, come on. Keep telling me.
Clockwise or anticlockwise first of all tell me. Current is going up right? Current is going up.
It will be clockwise or anticlockwise? Come on, yes Aishwarya, that's correct. Yes, oh yes, I am getting answers.
Anti-clockwise, Fenil you are right. So, why anti-clockwise? Come on, we know this, right? Which rule? What if they intersect ever?
It's not possible. If they intersect, that would mean they have two directions, which is not possible, right? So, this is a property.
Understand it, it is not possible that they intersect. Fine. Okay.
Magnetic flux. Why do you want to understand magnetic flux? It's in class 11th.
Like the amount of field lines passing through a surface area. That's different thing. Correct.
Right hand thumb rule. What do we do over here? A pattern of concentric circles around the wire represents the magnetic field which is shown like this. Alright.
Next, if we have two points, point Q and point P, what is the difference you can notice? The note is yes, yes, it's okay Sanjay. So, Cogscrew law is also fine.
I think Yashat you answered this the last time also, right? I told you. This is also you can apply but you know I feel this right hand thumb rule is more easier. Otherwise screwing things people tend to forget this.
Alright, point Q and point P tell me which one will have more strong magnetic field? Yes, why? Yes, it's correct. Q is closer.
Yes, so as you go far from the current carrying wire the strength of magnetic field will decrease. This is something which is very important to understand. Fine.
Alright. At Q it is more than the field strength at point P. Next question, what if we interchange the terminals of the battery or in another way you can ask, what if we opposite, make the current flow in the opposite direction then what will happen? Nice, nice, correct answers. Nikesh, anonymous person, very good.
Cartoon world, see ya, very good, nice. What will happen if we reverse the terminal of the cell, come on. If we reverse, what will happen?
Yes, yes, yes, now it will be clockwise, that's it, come on. You know this. Dil flow clockwise. Direction of magnetic field lines gets reversed and direction of current is reversed.
Yes, poles change, you are right. Disha, very good. Yes, Aishwarya. Magnitude of magnetic field produces increases as the current increases.
Yes, Ishaat. Nice, Nikesh. Nice and elaborated answer.
Good. So, if you want to increase the magnitude, what you can do is increase the current flowing, right? The amount of current flowing, it will increase the strength of the magnetic field, right? So, The rule which was governing all this direction thing is the right hand thumb rule.
How to apply it? Everyone, Sanskriti not today. Let's focus on term 2 right.
Extra information we can always gain, don't worry. So if current is going upwards, mark your thumb upwards and curl your fingers. What is this curling showing you? The direction of magnetic fields. You know this thing.
If current is downwards, thumb is down and curl your fingers. showing the direction of magnetic field. Alright, this is very important.
You know, you should learn and you should know very clearly how to apply this rule. Right. Okay, nice Vyabab, you understood it. Good.
Inside and outside plane. Inside and outside plane. This is coming. So you're asking me if it is going inside the plane or if it is coming outside the plane.
Right. Something like this. Yes, yes Nisha?
So don't worry this thing is coming, I'll explain this to you. So right now it's not about inside and outside, it's about if in this direction current is going, I'll just point my thumb and curl my fingers, that's it right? Fine?
So the thing inside and outside is this one. So when you don't have a straight current carrying wire but you have a coil, what is this? This is like a circle and current is going in this direction.
Now to find the direction of magnetic fields what you need to do is, come on think, think, think. Here, here current is inwards right. If you just take a note of your system, if your laptop screen, if your tab screen whatever it is. Think, it is going here means my fingers are telling me it is going in this direction. The magnetic field lines are going in this direction.
Fine, correct right in thumb rule. Maxwell's Cog Screw Rule is... So Aishwarya, don't worry about this.
It's nothing. It's just an alternative of Right Hand Thumb Rule. It shows in which direction you tighten the screw.
So it's okay. Don't think about it. You'll just be confused. Fine.
Guys, guys focus, focus, focus. Right? And here current is going in this direction.
Means in this direction. Okay? Like this.
So if you do this at two or four places you'll get to know in between it is a straight line. Right? Yes? What is going on?
Guys, focus. Fine, fine, fine. Okay. So, what do we get? Magnetic field due to current carrying circular coil.
If you have a coil like this, right, which means, what will happen? Come on, tell me. If you apply the right hand thumb rule at these two places, you will get to know magnetic field lines are going in this direction. Now, I understand the one way I am telling you right now. It's tedious, but it's something which you have learned.
alternate way which I would don't want you to you know apply in the exam but this is like a shortcut what you can do is this current carrying coil is going in this direction right curl your finger in the direction of current and thumb will give you magnetic field it's an opposite don't be confused if you are getting confused don't apply it but it's like a shortcut fine okay yes sukshot correct nice that's how you write the answer in the exam. Alright, so next time If you increase the magnitude of the current, you understand this. If we increase the magnitude of current, what happens?
The magnetic field strength increases, right? Correct? Yes, Isharth.
Easy but interesting and important. That's the most important thing. So, magnetic field increases with increasing current and it increases with increasing number of turns. If you increase the number of turns of the coil, what will happen? It will increase the magnetic field strength, right?
North or South Pole of the Loop? I'm coming to it. Don't worry. Don't worry.
I'm coming to it. Yes. solenoid, right? So if it's just one loop, right?
If it's just one loop and current is going like this, you have curled your fingers or let's say I can do this, right? Here current is going in this manner, it's telling me magnetic field lines are like this, if it is going here, I'll do alright, fine, it is like this, it will tell me, come on, now, yes, yes, yes, yes, good. Yes, it's not used in everyday basis, correct.
So, if there is a coil like this and this is the current, if I turn my fingers towards the current and give you, the thumb gives you the direction of magnetic field, what do you know about magnetic field lines? North, you know, outside the magnet they come from north. Means, if there is a loop in this manner, let's say, and you have just now understood, magnetic field lines are going like this, then this side will be north.
Fine, fine. Okay, no way, today Menti is not there, today it's only discussion of concept but, ha, Monday we'll deal with questions, fine. Alright, so you just came to know from this direction fields are going out, that is north and means on the opposite side they are going in, that is going to be south and don't worry, you'll understand this.
Yes, a solenoid acts as a bar magnet. So with a solenoid it will be more clear. Come on, let's understand this. This is plus, this is minus.
So you understood this. Here it is going to be North Pole. Don't worry, we have that shortcut also. Strongest field in solenoid.
This you know one, right? In between. Constant and strongest in between.
And a comment which just now came, it is similar to a bar magnet. I won't say exactly equal, similar to a bar magnet and I if I remember correctly someone of you asked this in the comments last time. So you know why do we say in the magnets case in a bar magnets why it is strongest at the poles, why not in the middle?
You know why? We never do this. Magnet is a solid object. In solenoid you can go in the middle that's why. Fine.
So that's why. Alright. Oh nice, Harry Minati. So what do you get? This is North Pole, this is South Pole.
So they are similar to a bar magnet. So the term you will use is, yes, yeah, very good. Similar but not same. Magnetic field lines of solenoid are similar to that of a bar magnet. Correct?
And I think I am getting answers. Alright. Papiya, you are not focusing, huh?
Oh, it's okay Shakti. Today, today just focus on the concept because I'm telling you this is a very important session and on Monday we'll be discussing very good and a lot of questions. So, that will be important.
Core is coming Swishti. This is, you know, we are moving towards that part. Alright, the factors affecting magnetic field strength. I got few of the answers in the chat but something is still missing. Come on, come on.
Rest of the answers. So, one someone told me reducing the radius or right okay amount of current. Easy, we understand this. If you increase the current magnetic field trends increases right. So, it's in the center.
I mean between the solenoid right. Correct, nice Sukhjyot, good elaborated answer. Yes, number of turns, yeah very good.
Number of turns, your answer is there. Correct. Coil work on two poles.
Yeah, coil also has two poles. I mean it's similar to a bar magnet. So, from one side magnetic field lines are going out, from another side they are going in, similar to a bar magnet. Correct?
Material number of turns. Right? Third one, the very important one is inserting iron rod. Now, this was your question. I forgot the name.
Sorry. So, the question was why it improves the magnetic field strength. Why? Someone gave me an answer.
It's ahead of your sleepers but still, I'll just tell you. This increases the strength by focusing the field lines. Right?
The field lines are able to focus more through it. And technically, technical term I think someone mentioned last time. Soft iron rod, very good, yes, yes, someone, someone, someone, it's okay. So, focus this, the soft iron rod it helps to focus the field lines better, yes, it also magnetizes, correct, in a way it is correct. I mean you will go in class 11th you will learn more about permeability.
and susceptibility and all these things but don't worry till here it's fine because it also magnetizes and it helps to focus the field lines better yes correct it becomes electromagnet yes you are right so magnetic field lines of current carrying conductors This is our learning till now. Let's just focus it one more time. Straight wire, we understand this.
Concentric circles are the magnetic field lines. In a circular coil, it is in this manner. And we know how to find the direction in both the cases. Yes, Rishabh.
It's a property of a material. More permeability. Don't worry. In this class, you don't need it. But yes, in future, you'll know this.
So Rishabh I have answered your question. Yes Sukhjyot, correct? Alright. So and what is the solenoid? It is again multiple turns right?
A coil is there but multiple coils are there. Similar. Nothing special in this. What we are going towards is, now this is new guys, focus, focus, focus.
Yes. Eddie, you have gone too far ahead. Yes.
Yes, come on. Aha, nice Sukhjyot is helping me out over there. Alright, come on. This is new. Hey Army public, Russian.
Force on a current carrying conductor in a magnetic field. What we are thinking now? If there is a current carrying wire in a magnetic field, we observe there is a force on that current carrying wire, right?
Krishna, I'm not sure but very soon you'll get to know this through the notifications. Something will be updated on the channel, don't worry. Papiya, what are you focusing on today?
Come on, come on guys. Thank you Anna. Yes, so let's focus on the force kicking wire experiment.
Yes, so what's going on? Our observation was there was a force on a current carrying wire in a magnetic field. Alright, how?
Now, if you see this setup right, there is this battery terminal connecting wires which means there is current in this wire, that's for sure. There is a magnetic field because there is a magnet right. Ready? Nice Disha, thank you.
Yes? So, what happened? When you turned the switch on, this wire moved, right?
Direction is fine, we will discuss about it. But first observation is, there is a force on a current carrying wire in a magnetic field. That is important.
Fine. Alright. If you interchange the terminals of the battery, means if you change the direction of the current, the force, the direction in which this conductor is moving, changes.
Reverses, I would say, right? Yes? Yes, correct.
Excellent. Yes, Ashish, correct. Alright, alright, nice, nice answer I can see.
Good. This is the most important question for exam. Yes, however, they focus on this a lot. That's why I am saying, focus guys, right?
Cool. Force on a current carrying conductor in magnetic field. Let's discuss this thing.
This is important. Lot of questions come from it. Outside solenoid, I can't say it's zero.
It will depend how far you are going. Similar to a bar magnet, right? How far you are going, right?
Alright, alright, come on, come on, focus, focus, let's move. So, displacement of the rod is maximum when the direction of current is perpendicular direction of magnetic field. What we did? You are physicist. The person doing this was also a physicist.
He started experimenting, right? started doing multiple iterations. What was observed that when the field is perpendicular to current.
Now someone was asking me what does inside mean and what does coming out mean. So these symbols X. X is mean it is going into the plane right and dots like this it means it is coming towards you like an arrow fine nice here all right yes yes left hand rules here correct So, maximum force was when the magnetic field was perpendicular to the current direction, right, to the current carrying wire, right, fine, yes, experiments which means you will enjoy the short series in this channel, right. Alright, next case 2, when the magnetic field is parallel to the current carrying wire, it means there was zero force, right, no Akshat, today Menti is not there, it's all about you and me discussing the magnetic effect of current, right? Yes, nice Charvi.
Okay, final. You are emerging physicists, right? Oh Rishabh, it's behaving like a magnet.
You don't go into the middle of the earth. It's like a solid ball showing magnetic properties. It's like a magnet. Fine? Okay?
So this was Rishabh's answer. Yes, come on. This is our observation.
Now came the Fleming's left hand rule. So we, observations we did. Now let's understand how to examine in which direction the force will be applied, right?
So here comes FBi. What comes? FBi.
FBi. And a lot of you who are, you know, who watch a lot of movies, you would know what FBI actually means. But why we are using it here, you wouldn't understand.
F is for force. B is for magnetic field. And I is for? Current, right? Okay?
Right? So, if you want to find the force on a current connector, whom to call? Call FBI, right?
What is FBI? F-B-I. This is F, this is B, this is I.
Fine? Okay? Right? Yes.
Scientist. Oh, for a moment I thought Stephen Fleming. Sorry. I'm not, right now I'm not recalling what the full name was.
But yes. What is happening? So if you have a current carrying wire, direction of current is this, means this is the direction of current, alright. Direction of magnetic field is this, this is the direction of magnetic field.
So current is this, magnetic field is this, this will be the force, means this will be force towards. upwards, right? Direction of force will be upwards in this case, fine? Yes, FBI. I mean, I just remember it like this.
It's easy to, you know, remember, right? Okay. It's okay, Mahavir. Rule clear?
The FBI. Force, magnetic field and current. Now we are studying all this, it must have some practical applications, I mean what good is theory if you can't apply it in nature right? And especially physics. I mean whatever you do, whatever you study, it's going around you right?
Correct? Yes, nice Rishabh. So I'm glad it will help you out. So, what do you see over here? If you bring a magnet, and what is this blue colored line?
What is this blue colored line? Come on, come on. Inside, Naveen.
So, what is this blue colored line? Come on, come on, tell me. It's, So, Kujyot, purpose is to find the force on the current carrying conductor in a magnetic field, right?
So, if there is a magnetic field and you have a current carrying conductor in a magnetic field, In this magnetic field, you can find using the left hand rule the force on that conductor, right? Ha! No, no, Charvi, that's not light.
You can call it alpha particles, you can call it electron beam, you can call it anything. But it's a charged particle ray, right? Cathode ray tube and all these experiments have happened, right? Yes, electromagnetic induction is coming, don't worry.
Ha! Cathode rays. Yes, good good.
So if you bring a magnet closer to cathode rays, what will happen? It will deflect for sure. It will deflect.
Why? Sir, current carrying wire and charged particle ray, what is the similarity? What is the similarity?
Current carrying wire, what does it have? What is flowing? Electrons are flowing. Charges are flowing.
So what does it mean? A flowing charge, a moving charge will experience a force in a magnetic field. Right?
Got this idea? Fine, fine, fine. Correct? Alright, yes?
Yes, charges are flowing. That's the important thing to understand. Guys, focus right now on this.
It's very important. So, got this? Got the understanding? A lot of questions will ask you.
They won't tell you the current carrying wire is there or something. They will tell you electron ray is going or alpha particle is going or positively charged ray is going and there is a magnetic field in which direction it will deflect. It can happen, right? Alright. Ah, that was Gold leaf electroscope experiment, is it?
Sorry, I just tend to confuse in this. So, electric motor. Let's talk applications. Because whatever you study, it needs to be applied in the real world.
Theory is fine. How can you apply it? That's the question.
Electric motor comes into picture. So what happens here? It is a device that converts electrical energy to mechanical energy. And that's correct. Why?
Right? You are providing it electricity. You are giving it electrical energy.
What it's giving you back? It's giving you motion. It's giving you mechanical energy.
And that's important, right? Yes, Sukhjyot. Correct. Haan Diksha, don't worry.
So LTH, left hand rule, you will understand to find the force on a current carrying conductor, right? So that is the left hand, fine. Right hand, I am coming to it, don't worry, don't worry.
Take care. And I have a way of remembering that as well. I don't know how many of you have seen MIB?
Have you seen MIB movie? Men in black? So I have a way of remembering it from that, so don't worry.
Yes? Can you find the direction of the force on this conductor? So, it's a very quick check I want to do. Come on, come on, it's okay Kashish.
Let's do this. Tell me, what will be the direction of force on this conductor? I'll give you two options then.
Come on, come on, I'll be quick. Up or down? So, Udaya that's a convention. Alright, so when they found current they thought it is the positive charge moving.
They made all the laws, all the things based on that. Nice, nice. Okay, right. But it was found later when J.J. Thompson found electrons.
No, it's the electron that moved. But they thought it's okay. Like you know, it doesn't hamper anything.
That's fine. So, all the laws kept in that manner. Right. Thank you Gaming Gangster.
Nice! Upward is the answer. How you found it?
Come on! Got this. Someone was asking me the left hand rule.
magnetic field north to south, alright north to south then current plus to minus alright current is here means forces upwards that's it fine simple so I can do this force is going to be up linear so what is up linear motion right if this this wire will tend to move up now tell me neutrons are uncharged moving charged particle I'm saying fine so come on In this case, what will happen? This is plus, this is minus. Here current is going in this manner.
Here current is coming in this manner. So what will happen? Kaushik, don't worry.
Lenz law, it's not for today. Snell's law, going towards light. Come on, come on, come on. Principal of electric motor, it will come, it will come, it will come. It's all coming.
It's possible because guys come on tell me what will happen to this condition? This condition? North and south pole are separate come on. Every small atom has it.
Yes, yes, yes. Ha! Alright I can understand you are telling me it will rotate clockwise.
So why? You understood if current is going like this force will be up. current is going like this force will be down here it is up here it is down it will rotate it will rotate clockwise correct right and we call it turning force right so what happened over here in this case force is upwards that we have understood in this case force is downwards and this is how I am showing you how to use your hands right how to use the left hand rule Fine?
Yes? Okay. Yes.
Okay. So... Hindi, English, it's okay, I'll try to keep a balance. But what happens is, Hindi people can still understand English, but people who are learning in English, they are not able to understand.
It's okay, you know, we live in India, so that's fine. And we are learning into English medium schools. that's fine. So, understand this, downward force on CD, it's a turning force, means this conductor should turn clockwise, that's my understanding and that's fine also.
But the thing is, when it will turn, right, when it will turn, let's say this turns like this, after half a turn, what will happen? What will happen? Tell me.
After half a turn, the current which is going inside, it will always face a force upwards. If this comes here, it will just keep on doing this, oscillation, right? Not necessary, it is maximum. Nisha, sorry.
Yes. Correct? So the thing is if you keep on maintaining the direction of the current as it started it will keep on doing the reverse direction keep on oscillating you can't do that you need somehow a ray Yes Sukhjyot, I think you got the answer. You somehow need a way in which you can maintain the current. On the left side coil, it should always be inside.
On the right side coil, it should always be. On the right side wire, it should always be inside. So that you somehow maintain. this balance right up and down always that's why you maintain a constant nice nice Arindam very good very good guys you are getting the answers.
A device that reverses the direction of electric current after each half rotation is called as commutator right it's called a commutator. Now let me show you how it works. Yes very good Tanushree. Correct! Split rings, you're right.
So what's happening? Now instead of doing just one connection you made this commutator and it rotates all together. Fine! So why at half rotation what's going to happen?
See. Always, always this end, this end is the negative, this end is positive always. Right?
So, whatever change happens, whatever rotation happens, the current direction will be maintained and the direction of force will be maintained in this manner. Right? It reverses the direction of current at each half cycle. Correct?
Nice. So this is called as splittering commutator and these are the carbon brush. Contact between commutator and external circuit.
Yes? Yes, kind of Vaba. In a coil, you know, a technical term will come, armature will come.
But for starters, we can call it a coil. Alright. When brushes are not touched, they become wear and tear. They are not able to touch. They fall down.
You have to change the brushes. So, fine. Alright, so what is a commercial motor then?
It uses electromagnets, large number of turns and an armature. So your question is there. Can we call it a coil? For starting you can call it a coil.
But if you want to be technical, we call it an armature. Fine. Yes. Coil wound on a soft iron core to increase power.
We read this. How to increase the magnetic field strength. Right.
How to make it more effective? Insert a soft iron core. Fine. Yeah. Alright.
Okay. So. So commercial motors are done, force on a current carrying conductor we have learnt this much, we are just recalling it, come on, come on, come on, guys fast, fast, fast, right there is a force on the current carrying conductor which rule gives me the direction of force, the left hand thumb rule, fine, correct, left hand is good enough, otherwise if you confuse between left and right you will find the direction of force.
opposite. So left hand thumb rule to find the force call FBI if you want to find the force on a current carrying conductor and the application is electric motor fine alright. Split ring in electric motor, split ring's rule is it reverses the direction of current it.
half cycle. Why? Because on the left side you always want the current to go in this direction. On the right side you always want the current to come in this direction. But what will happen?
If you don't change the terminals at each half cycle, this will go like this. Right? Take this example. This is going inwards, this is going outwards. If I change it, force will change.
So I always want this to happen like this. Oh my god, I will untangle my hands. Alright.
Oh, AC or DC, it's a question for another day, I would say Naveen, not today because you know, let's finish it first. All right. Now, we understood a lot till now, right? What did we understood?
Fine. We got the magnetic fields, current and magnetic field is related. So current is related to magnetic field, who found?
Ørsted. But you know what? Magnetic field is also related to current.
It is Faraday's experiment. So how does it change? Guys understand this one very simple rule first of all.
Right? Understand? Come on, come on, come on.
Focus, focus, focus. So, how will it change? You should have a relative motion between the magnet and the coil, first of all.
This is important, right? Why I am saying relative motion? If this is the coil and this is the magnet, it shouldn't go like this.
If you say motion is required, both are moving, right? Relative motion is required, right? This is important.
So, relative motion is the word, first of all. Thick. Second, how you can make current flow in the coil? By making the magnet move with respect to the coil. Either it is moving towards the coil, there will be a deflection in one direction.
That's fine. Yes, you got the word. Charvi, good.
Yes, and second way is the magnet can be moving away or far from the coil. Yes. Yes, so you got two ways news creators right till now? Alright Rishabh. So, when coil is moved towards magnet, I told you there should be little movement, fine.
If you move the coil, fine. If you move the coil away, that's also fine. Right?
Come on, got this? So, electro magnet magnetic induction, EMI we call it. Conductor moved in magnetic field and conductor placed in changing magnetic field.
This is also possible. So in both the cases you will get an induced current. Induced means, what is the meaning of induced?
I induced you. Because of me, you got something. This is called as induced or induction. Once again, you got it Disha. If let's say I need some help.
If this is the coil and this is the magnet. There should be a relative motion between these two. Means these two can't move like this.
No induction, no current will be induced. It should be moving relatively. You can move the magnet close.
Until and unless the magnet is moving, current induction will be there. It can move back. Two ways. Or you can bring the coil close or bring the coil away. Same.
Fine. Okay? Yes.
Now. Another, one more layer, one more layer of understanding. So till now you got, if you change the magnetic field lines around a coil, current will be induced. Right? Okay?
Focus guys, come on. So, there will be an induction of current. Correct?
You know? Now, you know that a solenoid is also like a bar magnet. It behaves similar to a bar magnet.
So what is happening over here? This... coil is connected with a source.
Fine. Now, if you turn the current in one coil, means suddenly there are magnetic field lines, means this coil, for this coil it is like a change in magnetic field lines, means current induction will be there. But until unless this current is flowing constantly, there will be no current.
The moment you turn it off, current. So, two ways. Yes, galvanometer shows the presence of current. Very good.
So, two ways. Come on, focus, focus. What's happening? The moment you turn current in this coil, there will be induced current in this. in one direction.
When you turn this off, again current will be induced in opposite direction. But sir, if we maintain the current, if we just keep the switch on in this coil, will there be current? No.
That's a no. Fine. Got this thing clearly?
Yes. And this all comes under electromagnetic induction. Fine.
Alright, now comes the question. So someone was asking me the difference between left hand and right hand. Let me tell you.
Guys, guys, guys, focus. So let me tell you. We understood if there is a current carrying wire in a magnetic field, it will be a force. You will call F, B and I.
Fine. Right? Yes?
Yes, Naveen? Correct, correct, correct, fine. Right, so this is something we have learned.
Alright, we have also learned what is electromagnetic induction, that is also fine. Now comes a question, sir if there is, if there is a magnetic field lines, fine. If there is a current carrier, if there is a wire, a conductor and it is moving, it is moving, then, then, come on.
Why? Why? Because a coil needs changing magnetic field lines, right?
The moment you turn the current in this, it will sense a change in magnetic field lines. It will tell current is there. The moment you turn it off, there's again a change.
It means there is current again. Fine. Okay? Yes. Now we are talking about if the conductor is moving, right?
It is moving in a magnetic field. What will be the induced current? Okay? Guys, focus.
I know this can be confusing. Understand? very properly.
There is magnetic field lines, there is a moving conductor in that magnetic field. We are understanding how to find the direction of induced current. For force you will call FBi, for motion you will call MIB.
My way of understanding. And you know what? MIB, if I tell you, they used to deal with aliens.
No. So, it's a superior thing. So, right hand.
Right hand is superior. For motion, I'll call MIB. For force, I'll call FBI. Okay? So, who will you call?
You will call MIB. What is MIB? MIB, M is for motion.
This is the motion of the conductor and index finger is always magnetic field. Don't worry about this. Index finger is always magnetic field. Take.
This is magnetic field, this is motion. Where will the current be induced? In this direction. Here also it was current. The only difference is this was force, this is motion.
Whenever you want to find force, call FBI. Motion of a conductor is given, call MIB. That's fine. It's okay.
Thank you. Got this? So this is motion, this is magnetic field line, this is direction of current carrying wire and all this is going into electromagnetic induction. Right?
So... Oh, let's take a break. I'll just give you this homework question and this question is not difficult. I'm understanding you can give me the answer right now, but still, if you want, read the question.
I'm giving you 30 seconds. Read the question and you can answer it in the chat. If you can answer now, that's fine. If you can answer in the chat, better.
Because it was supposed to be a homework question. But the way we have learned, I understand you can answer it today. Yes, Vibhav, correct. Okay.
I can see some answers are coming. So Disha, MIB, M is for motion right? MIB right hand for motion, FBI force for left hand right? Force on a current carrying wire, this motion because of motion the current induced this. Fine.
Alright, alright. I won't tell you the correct answer. I won't tell you. You can put it in the chat so that we'll know how many of you got the correct answer. Right?
Option dalna hai? Just put the option in the comments. That's it.
So, with this I would say, we've got you covered. And whatever we have learned today, I would want you to practice that. I would want you to revise that because on Monday, we'll be dealing with questions.
I understand this is an important topic. That's why we need to practice good questions and that's exactly what we'll do on Monday. so come prepared all right good evening yes good evening so guys like share subscribe if you feel it's helpful do these things and you know we'll keep doing what's best for you all right thank you take care and stay safe