Not really. It's because the child does not have the ability to understand the theory at their then level. And sir also encourage the child to find the answer with their own efforts which will be better helpful. Who knows, we may get yet another physicist
This is a very nice question! The best explanation I know comes from Feynman, with a thought experiment that shows magnetic force is just electric force in a different frame of reference. Allow me to explain. Imagine a wire conducting electricity. Since it has a current, electrons are moving through it in one direction. And since the wire itself is neutral, if you take any segment of the wire at any instant, there will be equal number of electrons and protons in it (with the protons being static, and electrons zipping by). Now suppose another positive charge is moving along side the wire, very close to it, when the same speed as the electrons. If we change the frame of reference to move with the speed of the electrons, we see the new charge is static, as are the electrons. But the protons are zipping by in the opposite direction. Due to special relativity, and lorenz contraction, the distance between the protons will reduce. From this perspective, the density of protons will no longer be equal to the density of electrons in the wire, resulting a net positive charge field around the wire - so our new positive charge will experience a push. The magnetic force is precisely a way to express this force in the original frame of reference, where the new charge and electrons are in motion. There the moving electrons give rise to a magnetic field, which is felt by the positive charge as it's moving, perpendicular to it's motion and direction of the magnetic force leading it away from the wire - resulting in same set of events.
@@companiongaming3794 To understand this, the only two things that you need to know are (a) relativistic length contraction and (b) like charges repel. It's not too difficult, but it is best explained with examples and diagrams. I encourage you to search for RU-vid videos on these topics there's ought to be many good ones. And/or ask anyone you trust might know about this locally!
@@ArnabBose you explained very well, but electric field is in itself not a real field ,and we use concept of field for Mathematical understanding of interaction of charges?
He is not physics influencer he is a physicist both are different things and don't compare him to influencers man he bought era of physics in India and on other hand most influencers are cringe
This is really an experimental fact, we doesn't really why happens at a deeper level. What special relativity says, it's just that an electric field of a point charge at rest is transformed to a magnetic field from your view point when you change to a moving reference frame. This is the reason why we usually say that magnetic and electric field are the same field.
A point charge has an E filed associated with it, and let's assume a test point a nearby. Now if the charge moves then vector E at the point a also changes. By Maxwell's eqn changeing E creates B and vice versa(curl E = -dB/dt & curl H = dD/dt ..). It's not the motion but change in E which matters.
Because question asked by student is 10th grade if sir start speeking about special theory of relativity he couldn't understand that is y sir said like that...
90% of students are watching this without searching Edit: Thanks for 3+k likes 2nd edit : moral of my comment is : to get like in comment do smart work not hard work😎😎😎
Thanks Sir. Just to summarize : 1) A static charge has the property that it produces Electric Field. 2) A charge when moving at uniform velocity has the property that it produces Magnetic Field. 3) A charge when moving under accelerated motion or is under an oscillatory motion, it generates time varying / oscillating coupled Electric Field and Magnetic Field which we call as Energy propagating in space i.e. Electromagnetic waves.
No under constant velocity charges produce both elec and magnetic field and under accelerated motionthey produce both types of fields as well as radiate energy. I dont know the reason as im preparing for jee so i didn't bother into relativity related topics
@@captainkarma7374 depends on frame of reference… nobody is moving at constant velocity ..space time of universe is accelerating and we are part of space time fabric
You would be paying more if you did the same thing with an AC, that is if you have set a low temperature,or your refrigerator for that matter. Therefore, I think your electricity consumption would be higher if you run the fan at a higher speed.
Yes. Wattage consumption of motor reduces if you run it at lower speed. However, that doesn't mean efficiency would necessarily improve. In short, yes bill would reduce. Hope this helps.
For anyone curious about why this happens, it's due to length contraction as explained by the special theory of relativity. Suppose there is a line of positive charges moving along the z-axis in the positive direction - a current. Consider a positive charge q located at (x,y,z)=(1,0,0), moving in the negative z-direction. We can see that there will be some electrostatic force on q due to all those charges. But from q's frame of reference, clearly the charges constituting the current will be moving faster in this frame. But that doesn't do much, since after all the Coulomb force clearly doesn't care about the velocity of the charges, only on their separation. But special relativity tells us something else. It says the current charges will appear closer together. If they were spaced apart by intervals Δz in the original frame, then in this new frame they will have a spacing Δz*√(1-v^2/c^2), where v is q's speed in the original frame. This is the length contraction predicted by special relativity. If the current charges appear closer together, then clearly q will feel a larger electrostatic force from the z-axis as a whole. It will experience an additional force in the positive x-direction, away from the axis, over and above what we would have predicted from just sitting in the lab frame. Basically, Coulomb's law is the only force law acting on a charge, but only the charge's rest frame is valid for using this law to determine what force the charge feels. Rather than constantly transforming back and forth between frames, we invent the magnetic field as a mathematical device that accomplishes the same thing. If defined properly, it will entirely account for this anomalous force seemingly experienced by the charge when we are observing it not in its own rest frame. In the example I just went through, the right-hand rule tells you we should ascribe a magnetic field to the current circling around the z-axis such that it is pointing in the positive y-direction at the location of q. The velocity of the charge is in the negative z-direction, and so qv⃗ ×B⃗ qv→×B→ points in the positive x-direction, just as we learned from changing reference frames.
@@Harsh-Singh-3.141 in this universe charges or matter is same till now as they form initially?. Means is this universe constantly changing it's form rather than the loss of single charge. May i know your qualification sir.
I myself searched for HC Verma on youtube when I was in class 11 during my jee preperations and was desperate he hasn't started it but iam in 2 nd year of my engineering in NIT now...and this came to my recommendations
This was actually on-point. Couldn't have stated it better. It makes me happy when students question the founding assumptions - these lead to deeper insights into how physics as a field of study works regardless of whether the question can be answered [for example, by pointing to a deeper layer] or remains unanswered [for the currently accepted true foundations of physics].
@@_.Infinity._ i just wish he doesn't get, it will create curiosity and to find that only point he will have to dig many other things and after he finds the answer, he will be Much knowledgeable Will love the topic and hence subject Will find things' connection in universe( as it is physics) And may be many more things .....
@@supremeessence5992 Yeah that's why sir HC Verma's books and other reputed books don't give solutions to all their questions. They do it solely with this intent in mind. Asking questions and then embarking your journey to find answers is what brings interest in things and is what has lead to all the great discoveries in the world. I myself developed my extreme love for mathematics this way.
I just want to thank you for writing those 2 wonderful books sir, it's because of those two books that I was able to get good marks in jee-physics(mains and advanced).which in turn, made sure that I got a decent rank of 6104(2018 mains general category). for anyone reading this as a jee aspirant I highly recommend solving concepts of physic vo1 and vol2, it was more than sufficient for me to crack jee. God speed.
@@mohithsathyanarayanan7882 Hi is HC verna enough for jee ? I am in 10th and i am really passionate for cse my maths and chemistry are sorted but physics i have just started to study?
you are a true teacher sir. every science student needs a teacher like you at least once in his/her life. thank you for spreading knowledge the way you do. I am a 3rd year physics student and i still watch your videos .
In an atom the electrons moving revolve around the nucleus so it accelerated and according to the maxwell theory of electromagnetic radiation every accelerated charged particles releases both electric field and magnetic field which are perpendicular in direction of oscillation but same along the direction of propagation. I think its clear ♥♥
Come in class 12th you see charge and current not need potential differnce ..and cell....and when you go to learn inductance .....then come on thiss chat and reply
Lol, and no one ever says what this magical 'Charge' is. Every attempt at an explanation to electricity always starts with "Suppose Charge Q exists at point X" It's beyond farcical.
@@scr_scr the person simply commented how they didnt know about magnetic field in 10th grade. i dont see the need to disrespect a particular religion under the comment. and you defending that comment shows how much of a pathetic person you are. hop off your double standards.
It's a good answer... It will satisfy the curiosity, knowing that there is a possible explanation and to get that one has to reach that level.. instead of neglecting the question...
As far as my thinking goes I think that the electric and magnetic field induced by a moving particle are the same phenomenon viewed by different frames of reference. Think of it like this "you are negatively charged and hence are being pushed away from the particle that too happens to be negatively charged so from your pov you are being repelled because of the charge and someone else looking at you from their respective pov might think that you are being pushed away because of the magnetic field" let's suppose that you are stationary so it may seem to someone that you are not at all affected by the fields...this was the best explanation I could come up with...🙌🙌
What special relativity says, it's that an electric field of a point charge at rest is transformed to a magnetic field from your view point when you change to a moving reference frame. This is one of the reasons the reason why we usually say that magnetic and electric field are the same field.
He is like Physics ke "kaaleen bhaiya" for those who literally love physics...studying physics for class 11th and 12th in india is like answering all questions from book written by him.... Greatness is hided under humbleness, patience like him. Hats off for your immense work in the field of creating joyful physics..to elaborate the beauty of physics briefly.... Love and Respect to you sir! Have a healthy life, we need more "Kaaleen Bhaiya" of your types.
It is so beautiful to have the same concept of special theory of relativity applied for two forces of nature in human range to have been observed. Gives a pathway to a complete new understanding for newtonian point of view😀
I truly respect you Sir from the depth of my heart , I like understanding concepts of Physics and You are just a great inspiration how Physics should be taught and studied , We all love you sir.
Whether the charge is moving or rest it always has magnetic field.. Not just magnetic field but all fields... But the value of the m field is 0! Actually when it moves it doesn't create a magnetic field cuz its always been in magnetic field.. When it moves what it does is.. It creates a distortion in the magnetic field.. For example imagine urself in water when u don't move the water is calm nd all but when u move you create a distortion nd continues disturbance in water field... Thats exactly how quantum mechanics works! (Imagine a infinite huge multiple graphs with all values 0s in it! Interaction of quantum particles distorts the graph values from hiking the values !
Sir i read your books till i passed +2 in 2009 CBSE and by god grace i scored 95 in physics and cleared PMT in 1st attempt and a great contribution was your concepts which are too good.May god bless you with good health.
I'm Abhinav.. currently I'm in 10 standard and I started reading this chapter from past 2 to 3 days and now RU-vid recommend me this from Hc Verma sir ... that's great 😯
When charge moves (wether positive or negative) it attracts the opposite charges nearby as per the magnitude of the charge or current. This attraction is one of the many causes(many of which are unknown)of electromagnetism.
Wonderful to hear from the legend. 😊. Sometimes I believe it gets confusing for beginner physics students as we usually learn about magnetic and electric field as a separate phenomenon and then come to know about their unification. However, its understandable as it might get difficult if we start explaining complex things first i.e special relativity and lorentz transformations. For simplicity, both electric and magnetic field are actually the same thing viewed differently in different frames of reference. Even a stationary charge will produce a magnetic field if we are moving w.r.t to it. What we perceived as electric field in one frame will be perceived as magnetic field in another frame of reference. But again, to understand these concepts clearly, we will have to abandon the newtonian mechanics that is so much rooted to our understanding that relativistic mechanics appears baffling to our minds.
Ok! Are u BSc Physics Graduate ? How can I better understand this frame of reference concept in context of electric & magnetic 🧲 field ? I am 12th Passed BSc Biotech Student
Sir I really love watching your lectures....not only you have written great Books but also you give superbly great lectures..... which are supeerrrrrr easy to understand and also the experiments you perform give a basic understanding of how does the particular thing take place.....I would be greatly honoured if I meet you once in my life......
I am happy to know,that now a days there exist a platform like your channel on which students can clear their doubts. When i was in class-x,then i also have so many question like that,after reading NCERT books,and no one answered my question.
same question when arise in my mind some time ago i got confused and then after reading EM WAVES chapter of class 12th i thought it's because moving charges emit EM radiations but today i find my self wrong this is actually a higher concept thanks to HC VEERMA SIR ♥ ♥
Thanks is not enough for your efforts sir We( engineers) are always grateful to you Although, right now I m working as software engineer . because of u I got highest marks in physics in my school
I usually have these kind of doubts sir , during my jee preparation, but due to time constraints I leave them and focus on problems , but sir when I see your channel , most of the times my doubts get cleared
Analogous to this, if a person moves in the society with a great zeal to do good (charge) he automatically builds a great luminous legacy (magnetic field) which everyone admires
1:29. Explaining a concept on the basis of implications put by due to the fact you accepted the previously related concept as the intrinsic property of something in that concept. I have had this issue with so many teachers. Dear HC verma sir, you explained it in way that perhaps no one could have explained. In school I often come across concepts which are based on previous concepts. And the question arises in my mind "why". It happens to all concepts regardless they posses some intrinsic property or not. My teacher would also reverse the question by deriving some implications because I accepted the previous concept without asking why. Even if I would've asked why they would simply brush it off or avoid it. And now teachers want me to question why on every concept, how can I do that if I had been always told to accept what was being taught. IDK but that's biased. And my school teachers weren't that great. When I was in primary classes teacher would blame me for incapable to understand anything and calling me I could never ever do anything in my life. Well I proved them wrong in 10th standard by scoring 80percent. I know that's not enough but that's a lot for a average student who was always told "you will fail always". I guess education system needs to evolve, because I have realized how even a single wrong word taught by teachers can have significant impact on their learning capabilities and direct impact on perspective of child towards subject like these. I can provide you with an example when I was young like in 5 or 6. While solving algebra I encountered a problem with solving LHS and RHS, I asked to my teacher, instead of explaining me how the LHS and RHS concept work that teacher explained me how to solve the question, presuming that I already figured out the LHS and RHS concept. it seemed like I had to memorize these set of rules for every such question and that's how I was solving maths until I thought of something which kind of opened my mind. The idea was basically equal sign indicates that two given quantities are equal, and by the quantity I mean you can put anything on LHS and RHS and equal sign has the conceptual property to only let equal quantities put aside that sign. If those given quantities are equal than you don't have to do any effort to equalize them. When you're given RHS LHS you basically have to make one of those equal to each other by manipulating loopholes in conceptual property of equal sign. Equal sign says, two given quantities put aside has to be equal, it does not state in anyway if it has to be intrinsically equal or you have to make it equal. Equal sign demands if you wanna put quantities aside it, then it needs to be equal. It doesn't care if you're gonna make it equal or it's already equal. These abstract concepts like maths need to be translated with accurate correspondence with the respect to it's intrinsic conceptual property. In order to solve maths you just have to know if you need to solve problem then look at question accurately and extract exactly what it says. You have to find loopholes. Well when you're solving problems you have to exploit loopholes and use those as way to extract results. And that way is the concept which you often hear from teacher. Teachers speak the question, they will tell you concept used and explain it. But never tell how to figure loopholes. So what many student end up doing is they memorize and understand the concept and try to it figure out how you can align that concept with the given problem, they establish a mindset so whenever they encounter a problem they're like "yeah this number goes in this method like this way and this value you have to put here.. " You see they're just putting values without realizing why you have to put the values. Well you might say, you gotta put values to obtain result but that's not how it works. Well those values and numbers along with given relations depicts the exact state of problem, in consideration with state with respect to objective of problem. it then pictures combined what the problem is.
Bro from patna Sir has only told the answer in books. I too have this question and by lots of research I came to know this- Charges are just formed from electrons or protons( while proton doesn't move). Both electrons and quark( that combine to form protons) are the most basic source of magnetic field. Due to their spin, Charges create magnetic field in a specific Orientation represented by magnetic field lines. Now if the charges are moving, they are not spinning, but even though charges create magnetic field but not in an specific Orientation that is why when current flow though straight wires magnetic fields are not developed in the way they are developed in a bar, round etc. magnet. But why the magnetic fields form according to thumb rule. Now you would be surprised to know that this rule has created a mindset. In actuall the magnetic field produced by straight wire carrying current doesn't has any specific north or south pole. It is just an illusion. Bro if anyone is seeing this comment please like it so that whenever the patna boy see this video, he see this comment at top🙏
Kudos to ur explanation 👍👍👍👍👍 seriously I can see why this is THE BEST explanation from a normal student point of view I have seen thank you for this❤️
He said correct . To know more about the connection of electromagnetism and special relativity , there's a good video on minutephysics with a simple cat analogy .
Physics is complicated at subatomic level. There are a lot of principles related to mass ,motion and charge that you need to clear before knowing the real reason behind this. This is not a question to be answered, it is a topic to be discussed, as i can see more questions would arise while explaining this. And HC verma sir, you're amazing . 😎
@A K Well put, and i agree with most of what you are saying. However there is no need for the magical particle part. Electrons have never been proven to exist, they are but a concept only. Electricity IS magnetism (energy in disequilibrium). Cut out the middleman 'electron' and things become clear. Indeed, the vortex is everything, the product of magnetism displacing magnetism with the resultant mass (energy condensate) displacing at the golden ratio, which is the angle of magnetic bonding of water. Thanks for the read and its good to know that I'm not the only one out there, perhaps I'm not taking crazy pills after all.
In simple, magnetic field is electric field observer experience in different frame of reference, this is a consequence of special theory of relativity's length contraction. as the charges moving, the number of charges per unit length increases bcz charge frame is under motion, so you feel greater electric field strength than if you are moving with the charge, this extra force we refer as magnetic force. And note this phenomenon is always inevitable process, so we use the term electro-magnetic field in all our study. and why the magnetic force is right angle to moving charge?. that is bcz, if you put a another charge in place of observer the force makes charge moving in right angle direction. like this we can frame lot of questions, and you can see, how many things are connected, the theory which meant to describe speed and time has wider scope to answer many un-answered questions in classical-mechanics, electro-magnetism and so on.. always go a step further to see the beauty. thank you - question everything!
"How special relativity makes magnet work..." By veritasium and minutephysics Search for it on RU-vid... U will get a better understanding of this concept and don't be afraid of physics concepts.. always try to understand the beauty behind it... Okay ? I am also in 10th class.. but I understood this concept long before...!!! Thanks
But their expanation is wrong Veritasium- why electrons moving when we percieve positive charges are stationary wont get dense and attract the positive charge outside wire
For the people who are like the dislikers are physics haters or envy Verma Ji, let me correct you people here. I am pretty sure the people who disliked are those 9th and 10th class smartasses who were expecting a textbook answer like the process of photosynthesis. Because both physics and Verma Ji cannot at all have haters. And a request to my younger brothers and sisters studying in 9th and 10th, follow your current curriculum and then focus on extra stuff in 11th and 12th. Trust me, after the beautiful journey of these two years your point of view for life and science will change forever. And what Verma Ji said that these properties are by default present, you guys will understand the true essence of his words after those two years. So, for now, whatever extra stuff you guys are reading, do it if you are understanding. If not, don't waste your time. Focus on your current curriculum. After your 11th and 12th and b.tech./b.sc. I am sure your minds will build up enough to think about these answers yourself.
Sir, I do agree with that first paragraph, but I think that not all people do that. I also am in eighth, and came here just to know how it all really works out. And this IS really a problem that while everyone expects to give birth to a hardworking and genius child, every teacher expects to have hardworking and intelligent children, but rarely( I don't have anything against teachers, I have utmost respect for them) does one help to really build that up. Some children just try to be over smart and ask idiotic questions, but if you take every child who asks a question higher than course for that, you are absolutely wrong. Sometimes, unknowingly, a question pops up in mind which is truly much higher than your ability to understand it just then , but it does. So the teacher may explain it as simply as possible. And believe me, students are not always as the wrong end. For example- my teacher had been discussing positive charge and negative charge, electroscope etc. for a week, and I just asked "Ma'am, can you please tell me what charge exactly is?". But the answer that I got was "you think you are so smart?" And then she went to every friend of mine and said Ill things about me to them. Was that apt?, sometimes teachers may also accept their inability to explain something simply, they are also humans, and it is not possible even for them to know everything. However, just accepting it increases your respect among students. Just constantly scolding a child and not telling the answer really hampers their curiosity towards studies as well. I could have been told that charge is a force exerted by subatomic particles and even smaller quarks and leptons(which you will come to know about later) and its positivity and negativity is just the different nature of the particle. But no, I was ridiculed and mocked at. Was that correct? No. And it can't be that you want a child to excel at study and not satisfy his curiosity at the same time. P.S - I have not said anything about Verma sir, please don't relate.
Charge at rest create only electric field. Charge at uniform motion create electric field and magnetic field both. Charge at non-uniform motion create electric field, magnetic field and radiates energy. I think it is whole up to 10th
When there isn't a potential difference, 1 electron moves left and 1 moves Right. So they Cancel each other out. However when there is a PD. Both move Right with gaps between them.
The answer to the question begins with a postulate of special relativity which states that the laws of physics is the same in all reference frames. In order to reconcile the fact that a charge can produce an electric field in one frame, and a magnetic field in another, we must assume that a charge produces an electromagnetic field, which is the generalization of the electric and magnetic fields that exists not only in space, but in spacetime. Under this assumption, you will see different projections of this electromagnetic field depending on your frame. In one frame, say the rest frame, the projection can be strictly an electric field, but in the "lab" frame, you will see a different projection which can include a magnetic field. These projections can be obtained by applying a linear transformation to the electromagnetic field known as a Lorentz transformation, which is a mathematical object that can take you from one frame to another.
I think physics too has its limitations to inquiry. The nature of a phenomenon is sometimes beyond questioning and is accepted the way it is for furthering its use. For instance, why does gravitational force or for that matter electrostatic force follow an inverse square law? It is its nature isn't it. In case there is a rationale I ll be happy to get educated. It is in this context, often we can see physics or science is about studying the phenomenon and explaining it rather going to even cruder fundamentals of understanding why the nature of the phenomenon is what it is. And it is not that science does not aspire to do that but there are limitations in nature to make measurements on these aspects. However, as long as the process of enquiry persists, I believe we will eventually one day understand the broader "why" about these things.😊🙏
Searching on Internet, I found that the colours of electrons, protons and neutrons are blue, red and green respectively. Now, atoms form matters. So if the colour of all atoms(electrons, protons,neutrons) are same of all elements. So we must see same colour around us due to reflection of light. But this is not so. Why??? What are colours??? Why some objects reflects light in such a way, the object looks of varied colours??? By the way I know the concept of diffraction of light, as light is itself composed of 7 colours. Class- 10 Student's Question.
Don't believe in colors. World is colourless, its only because of human eyes and processing of brain this world is perceived colourful around us. To understand about "What are colors" understand "How human eye works".
Explaining these beautiful theory in a beautiful way is also equally important teachers don't do that they just read the definitions do the derivations and give the formulas this is what is killing majority of upcoming master minds who used to crave for these knowledge but that craving has been killed by these boring classes and coaching classes I personally have been through this then I understood the beauty of physics after reading the concept of physics book by HC Verma❤❤ felt really bad for other student who cannot see it. Anyone reading this please check out sir's book its really interesting you just need to have patience and a good concentration while reading it your mind will be blown
Physics becomes as interesting as a sci-fi film if you study it with visualization and proper understanding. He helps us to visualize and understand the concepts of physics.
No your are wrong, if you observed any sci-fi films one mistake is common in space, that there is no medium so think about , how spaceships sounds are coming in battle or moving with speed?
Consider a neutral wire with some electrons and protons in equal numbers now let the electrons drift (current). Now imagine a proton near the wire moving with same velocity as the electrons in the wire , now here the theory of special relativity comes into play as in the frame of reference of proton, the proton and electrons in wire are moving with same velocity but proton in wire are not, hence the distance between the protons in the wire will decrease (by special relativity)which will increase the proton density in the wire therefore the proton outside will experience an electric field that will exert a force on the proton . Now if we look at this situation from non inertial frame the charge outside will appear to be moving so we have to consider a force in account of the moving charge which we call it magnetic force . So basically magnetic field is an electric field just from different frame of reference.
All I wanted to know "why the charges have that property" but all I got was - what I normally got through out my school time : "it's a fkin property of a charge particle"
