A Level Physics: Lenz's Law explained

Рет қаралды 64,371

ZPhysics

Күн бұрын

Пікірлер

@houseflyer4014 2 жыл бұрын

I was absolutely clueless when we covered this in class. Thanks so much for clearing it up!

@zhelyo_physics 2 жыл бұрын

very happy this is useful! : )

@candicelamouri7237 2 жыл бұрын

this is the only video that I could understand Lenz's law, thank you so much

@zhelyo_physics 2 жыл бұрын

Thanks a lot for the comment! Glad to hear : )

@florentinosanchez3969 3 ай бұрын

Ive been days looking for explanations that convince me, and this is the only video in youtube that did. Thank you so much

@zhelyo_physics 3 ай бұрын

anytime, thank you very much for the comment!

@tiathathiah9861 2 жыл бұрын

OMG THANK YOU. I’ve literally watched about 5 hours of videos on this and could not understand. Watched this and I understand in less than 5 minutes

@zhelyo_physics 2 жыл бұрын

My pleasure, so glad this to hear this and welcome to the channel! 😀

@seb804 6 күн бұрын

I've watched every video on this topic, but finally, this one made it click!! Tysmmm

@zhelyo_physics 5 күн бұрын

fantastic to hear! Thank you for the comment!

@gudelala Жыл бұрын

i watched about 3 other videos before this and was still confused, your explanation was short, simple, and easy to understand. thank you!!

@zhelyo_physics Жыл бұрын

wow amazing to hear, thank you so much for the kind comment!

@IwokeUpInSOMA 2 жыл бұрын

I struggle to learn concepts sometimes, but yet my vocabulary is quite good so theoretically i should have no problem understanding concepts in general. This was a tricky one, as was Lorentz Force, but your explanation has cleared Lenz's Law up! Thankyou!

@zhelyo_physics 2 жыл бұрын

Glad this has been cleared up! Thanks for the comment!

@jamiewalker329 8 ай бұрын

I think it's easiest to not refer to magnetic north or south at all (for the coil). When moving the magnet to the left, there is an increase in magnetic flux through the coil to the left. The coil simply responds to oppose this change by Lenz's law, by creating it's own magnetic flux to the right, and so my right hand grip rule the current circulates in the direction indicated. This is more general than the "coil magnetises this way, depending on whether the fixed magnet is being moved in/out", which isn't particularly helpful for other configurations, e.g. if the area, or the angle of the coil is what is changing (rather than the position of some external bar magnet). For example, consider a magnetic field into the page, and metal loop of wire drawn on the plane page. If the metal wire is "scrunched" then there is a change (decrease) in area, thus a change in flux and an emf generated. The external magnetic field hasn't been "moved", so it's really difficult to tell which way the current should flow by assigning a north and a south to the coil like in this video. If we just stick to magnetic flux, then we can say the flux has decreased into the page during scrunching, so the coil tries to oppose it by reinforcing the magnetic flux into the page by creating it's own magnetic flux into the page, and thus the induced magnetic field is into the page, and by the RH grip rule the current circulates clockwise.

@tejasvigill5741 Жыл бұрын

I FINALLYYYYY understood Lenz law after watching a 100 videos, this was the one that made me completely understand the concept

@zhelyo_physics Жыл бұрын

Amazing! Thank you so much for the comment!!

@matthewbeasley2336 Жыл бұрын

Your explanation of how the induced magnetic field has to oppose the changing one finally made it click for me - thanks so much! (Am revising for my mocks)

@zhelyo_physics Жыл бұрын

Anytime! Glad to hear. Good luck with mocks!

@fizzabatool3016 Жыл бұрын

Omg thank you sooo much!! I knew this phenomenon was the case but never had a full explanation behind it. Which is really important when it comes to applying knowledge. Thank you thank you thank you!!

@zhelyo_physics Жыл бұрын

Thank you so much for the comment! Very glad this has been useful!

@Prinsofthenight Жыл бұрын

I don’t understand how the coil will change from north to south when moving the magnet away. Why can’t it still be a North Pole?

@zhelyo_physics Жыл бұрын

Excellent question. If it was a North Pole, the two would attract breaking conservation of energy.

@hamdanadeem7442 10 ай бұрын

@@zhelyo_physics but how is it changing I don't understand that 😭 how did it just change from north to south when the magnet is pulled away

@worlddeobination4226 10 ай бұрын

@@hamdanadeem7442 It’s more like the direction of current induces the magnetic field with the north and south. When the magnet is pushed in, the current inside the coil will move down creating a magnetic field where the North is on the right and South on the left. (This comes from the RHR of a moving current. You point your thumb in the direction of the current and the rest of your fingers curling is the direction of magnetic field.) Now when the external magnetic field is being pulled out, the current will move up where it’s own magnetic field will have North on the left and south on the right. So essentially, it’s the direction in which the current moves that explains the direction of the magnetic field in the coil and where north and south is. Sorry for the wordy explanation. I’m studying this unit for my test too and explaining it like this helps me understand it too. Lemme know if there is still something you don’t understand.

@AbirNourelhouda 8 ай бұрын

@@hamdanadeem7442the coil doesn't actually have two consistent north and south poles but they are defined according to the direction of the induced current

@Hecate1002 7 ай бұрын

@@hamdanadeem7442Magnets has a consistent northpole and south pole while the coil does not have a consistent north pole and south pole. So when you approach the north pole magnet facing the north pole of the coil it literally opposes since unlike charges(N &N) repels and when you take the magnet away the side of the coil that suppose to be the North Pole changes to South Pole because the coil reverts to neutral states since there's no more induced emf in the coil. So I think the creator just try to explain that the northpole of the coil will try to oppose the change from the northpole of the magnet while when we take back the magnet from the coil it determines that there's no more induced current that's why it change from north to south, badically in real scenario theres no more north or south pole in the coil . I hope i explain it clearly😊

@clairetaylor3365 2 жыл бұрын

Hey there! Love your videos. I do have a question though: If you used the south pole of the magnet would the effect be the opposite, or do we only need to know what happens when the north pole of a magnet is moved towards or away from the coil? Thanks!

@zhelyo_physics 2 жыл бұрын

Yep! The effect is opposite in this case. The current always goes in a way so as the oppose the magnet.

@clairetaylor3365 2 жыл бұрын

@@zhelyo_physics thanks a lot! Makes sense :)

@Alevel_Physics 9 ай бұрын

Dude🎉🎉🎉🎉,thanks man,finally got it now the current itself will be strategically placed so that it produces a magnetic field to opppose the change that caused it so we conserve energy right❤

@zhelyo_physics 9 ай бұрын

fantastic to hear! spot on! thanks for your comment!

@ArifSelect1 2 ай бұрын

can we use 3rd Law of Newton as example to approach a simple explanation about this ?

@Vineger23 7 ай бұрын

@zhelyo_physics I was wondering. Where does that current come from when it is induced in opposite direction? Like if all electrons are going already in 1 direction, where does new induced current get its electrons?

@zhelyo_physics 7 ай бұрын

great question! we need a conductor with electorns already available to induce emf.

@Vineger23 7 ай бұрын

@@zhelyo_physics Yes, but all electrons are already flowing in 1 direction. Are they?

@summerfatima2525 Жыл бұрын

Great explanation that made it very easy to understand! Thank you!

@zhelyo_physics Жыл бұрын

Great to hear! Thanks for the comment!

@plop.mp3246 Жыл бұрын

Hi sir, could you please add this video to your Year two A level content electromagnetism playlist?

@Vineger23 7 ай бұрын

@zhelyo_physics Yes, but all electrons are already flowing in 1 direction. Are they?

@zhelyo_physics 7 ай бұрын

You mean in induction? There is no current before the movement of the magnet.

@Vineger23 7 ай бұрын

@@zhelyo_physics I am talking about circuit(not magnet).

@mirchakarazamrind-eo5xf Жыл бұрын

Sir how can we know where we should apply right hand rule and left hand rule

@zhelyo_physics Жыл бұрын

Hi, the right hand rule listed in the video is for solenoids only. For other situations, use the left hand rule. There is also the right hand rule which is separate for the direction of the field around a wire. I can see how this can get pretty confusing pretty quickly, actually!

@DravenFNM 8 ай бұрын

this vid cleared a lot of confusion ty

@zhelyo_physics 8 ай бұрын

Fantastic to hear! Thank you for the comment!

@faizananwar571 Жыл бұрын

I don’t understand what happens to the current when we move the magnet through the coil does it change direction ?

@zhelyo_physics Жыл бұрын

If the direction of motion changes direction.

@faizananwar571 Жыл бұрын

So how will a current distance graph look or something like that

@faizananwar571 Жыл бұрын

@@zhelyo_physics if u move the object faster will it induce a higher emf

@faizananwar571 Жыл бұрын

Also one more thing is endured emf the same as w/Q for a constant area of flux density

@faisala7746 2 жыл бұрын

THANK YOU. FINALLY! FINALLLLYYYYYYYYYY

@zhelyo_physics 2 жыл бұрын

Glad this was helpful! Thanks for the comment!

@sportmaster2586 2 жыл бұрын

Why does the current go anti clockwise in the first example ? I understand why it's a North pole to repel the magnet. Thanks Sir

@zhelyo_physics 2 жыл бұрын

so this is a consequence of Fleming's Right Hand Rule, I might do a follow up video on that. For the exam worth remembering that if the magnet is moving towards it, the current will be down and if you are moving away it will go the opposite way.

@sportmaster2586 2 жыл бұрын

@@zhelyo_physics Thanks for replying Sir - is it okay if I remember it as if a North pole is induced, it's like the bottom of the N turning ACW. And for a south pole, it's like the S is turning clockwise

@florentinosanchez3969 3 ай бұрын

GREAT VIDEO!!!

@Aditya-vh9ii 2 жыл бұрын

this was amazing thank you

@zhelyo_physics 2 жыл бұрын

Anytime!

@godrush6256 Жыл бұрын

thanks for the hand thing 👌

@zhelyo_physics Жыл бұрын

anytime! The right hand rule for solenoids is not commonly mentioned with Lenz's law.

@9_______9_______9-i9m Ай бұрын

I dont get why people are so bad at teaching this. You helped a lot. This and gyroscopeic motion are something teachers really struggle to explain it seems like lol

@zhelyo_physics Ай бұрын

Thank you so much for the comment!

@srikrishnarr6553 Жыл бұрын

Amazing explanation ..So easy

@zhelyo_physics Жыл бұрын

thank you for the comment!

@Vineger23 8 ай бұрын

Thank you so much. I really appreciate that.

@Vineger23 8 ай бұрын

I have a question about inductors. How do inductors really work? Does change in current makes changing self-inductance and which generates these EFS currents that are pointed in opposite direction of initial current?

@zhelyo_physics 8 ай бұрын

anytime!

@zhelyo_physics 8 ай бұрын

in short yes, excellent! I think I need to do a separate video on inductors.

@Vineger23 7 ай бұрын

@@zhelyo_physics I was wondering. Where does that current come from when it is induced in opposite direction? Like if all electrons are going already in 1 direction, where does new induced current get its electrons?