A Level Physics Revision: All of Electromagnetism (in 38 minutes)

[@sweepyb]

I wish the best of luck to the people, including myself, that are learning the content just before the exam.

[@zhelyo_physics]

Good luck! Drop a comment, if something doesn't make sense!

[@jayabrahim]

good luck man

[@naimul1626]

ong bro good luck to you

[@sayramahmud4397]

Big exam tmr!!! Thank u for this ❤️❤️

[@imthetrollman9279]

literally me thanks bro

[@gauthampaul4213]

revising for my board exams right now, although this is for OCR, it is immensely helpful for CIE as well, thank you so much!

[@zhelyo_physics]

Anytime! Glad to hear, the core content in most exam board is very similar. Good luck with revision!

[@gauthampaul4213]

@@zhelyo_physics Thank you sir!

[@puddleduck1405]

how did it go

[@Tharushi_SM]

This is brilliant, very very helpful. I love how you explain. You squeeze in all the details really well. Connects each and every concept to one another, actually love it. Thank you so much.

[@zhelyo_physics]

Thank you so much for the comment!

[@Ilya_012]

You contributed into lives who watched this video by doing thorough explanations; you saved us, man

[@zhelyo_physics]

thank you so much for the comment! So appreciated!

[@zandervisser5245]

mocks coming up, this is very handy :)

[@zhelyo_physics]

Good to hear! Good luck on the mocks!

[@sameenseerhan1315]

What a lecture! Hats off. Helped me real good.

[@zhelyo_physics]

Thanks a lot! Glad it helped!

[@ibakhan9725]

Best lecture on electromagnetism. Keep up the good work Sir✌✌

[@zhelyo_physics]

Thank you!

[@kaijss]

FBI is the best way to remember Fleming's left hand rule. F = force (thumb) B = mangetic field (index finger) I = current (middle finger)

[@zhelyo_physics]

that's so good! Thanks, never heard of this!

[@ogaremmanuel1669]

So grateful for this , thank you sir

[@mofazzalhossain2944]

❤ thanks.

[@gilbyjackson304]

ahahaha damn thats much easier. I've been literally just using ForceField Current, and remembering because it sounds like something out of starwars ahahaha

[@raiderrayschannel2712]

FBI open up

[@Nilashaaaaa]

20:32 I’m pretty sure the diagram next to it on the right is the one where the field line is parallel to the area sir!

[@zhelyo_physics]

excellent question, parallel in the context of the angle shown is parallel to the normal of the area, not the area itself. It's a tricky point. Hope this helps!

[@ZainAli-nk1rq]

You are insane, helping me finish my a level physics faster! Cheers boss

[@zhelyo_physics]

Anytime!

[@alexanderlund-jackson6864]

final is tomorrow, thank god for this video

[@zhelyo_physics]

Good luck!

[@a.r1s]

I religiously recommend this youtube channel to my friends lol, no other channel compares to the understanding I gain from you bro

[@zhelyo_physics]

Thank you so much! I really really appreciate this! Deep understanding of physics is precisely the goal of this channel. Thanks!

[@shaikhmehrabrahman4765]

That was very helpful! Thank you so much sir, much appreciated.

[@zhelyo_physics]

Thank you for the comment!

[@lisazeng9193]

This is actually super super helpful thank you so much

[@zhelyo_physics]

Thank you for the comment ,great to hear!

[@sithumsankalpa7445]

Is this called 40 minute magic??? Thank you sooo much sir God bless you. And pls pls pls keep uploading more videos

[@zhelyo_physics]

Thank you so much for the kind comment and glad this is useful!

[@amajdalaweyeh1582]

My favourites channel for a level physics. well explained

[@zhelyo_physics]

Thank you! Much appreciated!

[@BisseckHandtCarolineChantalDam]

Wow wow wow ,I am amazed ... You did an incredible work here ...now I can finally understand magnetism🎉 . God bless you sir ,continue with the good job 🎉🎉

[@zhelyo_physics]

thank you so much for such a kind comment! So glad this is helpful!

[@georgeglynatsis8632]

You should definitely do a video on Hall Voltage, as I see that it is missing. These videos are amazing!

[@aquss33]

Best video on the subject I've watched

[@zhelyo_physics]

thank you so much for the comment! Much appreciated!

[@Ribo_Flavin]

Best A Level Physics channel

[@zhelyo_physics]

thanks a lot! Much appreciated!

[@noahblackwelll]

lovely stuff thank you sir, actually quite similar to AQA spec as well !

[@zhelyo_physics]

Anytime! Physics is physics : )

[@AndyChan-cx2hw]

Thank you very much! You have once again helped me improve my physics grade!

[@zhelyo_physics]

anytime! very glad this is useful!

[@abdubguracha]

best channel ive come across since you cover the same board and teach brilliantly, thank you very much. lets not forget the drawings too lol.

[@zhelyo_physics]

Thanks a lot! Really glad to hear this : ) Good luck in revision!

[@soraiyahsamantha3597]

Sir, thanks a lot. Your videos are helping me a lot. I am revising all the syllabus of physics with the help of your videos which is my life savior. Can you please upload a revision video on Alternating Current (AC) it will be very helpful for me Thanks 😃😄

[@wofaiibor3353]

Same here,i really found this topic complicating but thanks to this 👍 unique teacher.

[@zhelyo_physics]

@@wofaiibor3353 Thanks a lot!

[@lux_iao]

POV it’s 3 hours before the exam

[@Amnah_Umar]

my dude it always is

[@madarauchiha8508]

7:28 Using Right hand grip rule on the diagram, wouldn't the North-pole mentioned in the video be South-pole instead and vv? According to the fact that the for a cross sectional area of a solenoid, if the current is flowing anti-clockwise, it is North end of the pole and if it is flowing clockwise, it's the South-pole, the diagram is again reversed.

[@zhelyo_physics]

Excellent question. The field is definitely correct. Some further drawings can be found here: hyperphysics.phy-astr.gsu.edu/hbase/magnetic/solenoid.html Best to think of the field of a single ring, which is also explained here: hyperphysics.phy-astr.gsu.edu/hbase/magnetic/curloo.html Hope this helps!

[@madarauchiha8508]

@@zhelyo_physics hmmm. As the coil is drawn in 2d, I feel this is one of those cases where you can't tell the whether an object is closer to you or not. Taking the side that I first viewed closer to me as the farther one is definitely helping.

[@madarauchiha8508]

@@zhelyo_physics Nonetheless, great video. Helping me through my OCR revision.

[@Jake-ie6bi]

I hate magnetism; praying to god that there isn’t a 6 marker on magnetism in OCR P2 or P3

[@salsabilaaurelia2111]

Thank you so much for the amazing video!

[@zhelyo_physics]

anytime! thanks a lot for the comment!

[@bryceanderson7468]

Would it be ok to use F=BILsintheta if theta is the angle between the area and the field lines (ie the angle u said not to use) Thank you for posting this content it’s really helping btw.❤

[@zhelyo_physics]

Yes, absolutely : )

[@BasinguraFortunate]

I love it for simplifying it that way thanks

[@zhelyo_physics]

anytime! thanks for the comment!

[@puddleduck1405]

for 33:25 , if we have to find the emf, would we have to draw a tangent at that point, and then find the gradient of the tangent?

[@sungdripwoo7887]

yh

[@noorahmed9934]

Thank you for this great resource!

[@zhelyo_physics]

Anytime! Thanks for the comment!

[@okamidt3298]

Am I the only one noticing the drawing for a magnetic field around a current carrying wire is incorrect? If the current going into the screen creates a clockwise field, and the current (as originally drawn before he adds the second arrow) is shown traveling from left to right and out of the screen, the fields should be going counterclockwise but they’re not, they’re going clockwise.

[@zhelyo_physics]

Hi, let me have a look. After browsing I don’t see a mistake, but if you let me know which time exactly I will have a look. Thanks for watching!

[@SanjaySingh-ep1hx]

7:07 ....but wouldn't the magnetic field be travelling from A to B in the front and B to A in the back , since they have to run a full circle. So why did we assume only the first case to be the answer ?

[@zhelyo_physics]

Just a matter of reference point. Looking at the diagram as it is drawn in the picture we can describe the field as going out of the page/screen at A and into the page at B . An alternative way to think about it outside of the diagram shown is to imagine a wire with the current going into the page, the field will then be circular with a clockwise direction. Hope this helps!

[@zhelyo_physics]

Excellent question by the way!

[@aniruddhaadhikary7506]

Outstanding lecture 👍👍👍

[@zhelyo_physics]

Thanks a lot!

[@Infinity-ce4qz]

Your Videos are just soo good

[@zhelyo_physics]

Thanks a lot! Much appreciated!

[@rachelle9518]

Sir could you please do a video going through electromagnetic revision exam questions these videos are so helpful !!

[@zhelyo_physics]

Hi! Check out the community post I have just done, I have recorded virtually all recent questions and summarised them in links to the past paper videos, hope this is useful!

[@rachelle9518]

@@zhelyo_physics omg thank you so much your video helped me understand the topic so much !!

[@zhelyo_physics]

Anytime! Glad to hear!

[@sarahmclaren7098]

Fantastic Video, Thank you!!

[@zhelyo_physics]

Glad it is useful! Thanks! : )

[@TheRealEmerald.]

For the magnetic field around a solenoid, how do you know for sure which end is the North pole? Is it the right hand grip rule, because when I try to use that my direction for the magnetic field changes depending on which end I look at (if the current is going up or down).

[@zhelyo_physics]

Hi, I have covered this here: kzbin.info/www/bejne/fYXce5aJr6mLsLs

[@DevPatel-cq1bw]

Thanks so much, this helps a lot!

[@zhelyo_physics]

Anytime! Glad to hear!

[@Sukumaro]

appreciate your drawing

[@zhelyo_physics]

haha thanks! It took a while! Difficult to teach a 3D concept on a 2d surface.

[@DRMAOMMAIZEINNG]

5:31 ruler jumpscared me lol

[@finlay.burt11]

Exam is in 9 hours and 25 minutes, we are getting in uni!!!💪💪💪💪

[@titanium6614]

Yoo really neat lecture. Good job

[@zhelyo_physics]

Thanks a lot! : )

[@hadiyafarrukh3057]

Hello sir, did you make a video on the graphs that are in EM induction B VS T graphs, the ones with the weird shapes, sometimes rectangle etc

[@enbunnymoarmy5912]

Another way I use to remember 11:33 Fleming's Left Hand Rule is "FBI"

[@enbunnymoarmy5912]

ohh just saw someone else commented this already haha

[@zhelyo_physics]

Thanks for mentioning it! Before the comments I had somehow never heard of it before : )

[@jonathoncornly7779]

If you were a stock, I'd invest in you rn!

[@xavierbritz]

Great video thanks!! Would it be possible to do a video on the possible experiments for elctromagnetism please? Your materials video was very helpful.

[@zhelyo_physics]

Great suggestion! I am working on it, however just to mention that the possibilities with electromagnetism are almost endless, but hopefully it will still be helpful in terms of a general direction.

[@xavierbritz]

@@zhelyo_physics Yes it will be helpful! Thanks

[@elmoismoneycash2695]

So, if I understood BILSinTheta correctly, then the electrons move in a spiral in the direction of the current flow?

[@SyedghulameTahaBukhari]

03:53, shouldnt the filed lines on the fiest wire be going anticlockwise?

[@wofaiibor3353]

5:43, please was that Fleming's right hand rule,am confused

[@zhelyo_physics]

yes, correct!

[@it5official484]

4:10 damn good drawing tbf 😭😭

[@zhelyo_physics]

ahaha thank you!

[@magicxcs2102]

Excellent drawing Z. I appreciate the video as always, helping me prepare for next months exam....

[@zhelyo_physics]

Thanks!! Glad it's helpful, good luck on the exam!

[@faizatauqir2945]

Why haven't you included the hall effect and the current balance method?

[@zhelyo_physics]

Hello! They are not part of all exam board specs.

[@VandanaBokka]

Is it good for any Olympiad exams ??

[@zhelyo_physics]

just as an intro! For Olympiads (iPhO you need to go into much more mathematical depth including Maxwell's Equations), working on a video on that, stay tuned!

[@siamsama2581]

Why do they teach Flemming's Left Hand rule at school? At uni right now all I ever use is the right hand rule for all cross product based stuff including EM. What's so special about Flemming's Left Hand rule?

[@zhelyo_physics]

I agree. Most likely historical reasons. From uni I just tended to remember the cross product rule which together with some intuition about vectors is very powerful.

[@DRMAOMMAIZEINNG]

23:00 wouldnt you need to do a bit of trig to find the area

[@crazykid073]

No, just 90-55 to get angle subtended by normal, then times area by cos angle Think of the cost part as working out the fraction of the area that is 'in the right direction'

[@pkkhangaming6527]

very very good

[@zhelyo_physics]

thank you so much!

[@dearlantsov]

in the edexcel book they used Φ=BAsinθ instead of cos. so i guess the graph here 32:15 would be different too, since sin90=1?

[@zhelyo_physics]

Yep! Correct, I teach OCR and the angle is defined in terms of the normal. If they used the sin graph it would be defined in terms of the surface which makes total sense. The graphs would look the same, just shifted by 90 degrees. Thanks for your comment, very useful to know how various exam boards define quantities.

[@studysaram3939]

Is this video alone enough for the exams?(With ofcourse Past Paper practice)

[@zhelyo_physics]

I would also have a look at any teacher notes and the syllabus to make sure you have covered everything. I also have a video on electromagnetism experiments I would add to this. Good luck!

[@michael2592]

Life saver

[@zhelyo_physics]

Thank you for the comment!

[@chillsup7821]

Really Helpfull💯👍

[@zhelyo_physics]

Glad to hear! : )

[@a.r1s]

Hi again, at 3:10 'current' into the screen is a cross, but at 13:51 a cross is the 'magnetic field' into the screen, just wanted to clarify why that is different?

[@zhelyo_physics]

excellent question. So the cross is the direction only and not the quantity that is in question. Think of it as an arrow that could signify things like current, force, magnetic field etc. The only difference from an arrow drawn on the screen is that this arrow is into it. Hope this helps!

[@zenature4633]

i saw very good thing on you. this vid initiate some ppls like me

[@kausarlolz]

hi sir, what do we need to know for an AC generator (OCR A)? do we need to know the brushes and slip rings? or just that the rotation of the coil causes change in flux therefore emf and current induced?

[@zhelyo_physics]

we need to understand the principle of operation, in terms of basics of electromagnetism and changing of magnetic flux linkage. Brushes, slip rings are not on the specification. If something like that appears it may be part of a diagram or context set within the question. Hope this helps!

[@kausarlolz]

@@zhelyo_physics great thank you sir

[@MangoJeez]

Nice one dude

[@zhelyo_physics]

No Problem

[@vidstar123]

Hi!! Thank you!! It has helped so much!! Have you got anywhere I can get the notes?

[@zhelyo_physics]

anytime! Sorry only the videos are available, I do encourage students though to use them to make their own notes.

[@vidstar123]

@@zhelyo_physics okay thank you!!!

[@devakp8832]

What kind of practical skills could they assess to do with Electromagnetism?

[@zhelyo_physics]

million dollar question! I will make a video about it but the best thing to do would be to know the spec inside out, then, solve all the available problems. In short things could appear include - any situation in which there is a changing flux, creating an emf, or lots of things including oscilloscopes or graphs and gradients.

[@AarhaamAaqib-oo1fr]

Is there any way we can get this revision pdf

[@zhelyo_physics]

Sorry only the video is available. Hope all makes sense, drop a comment if something doesn't.

[@milanbatinica244]

Thank you!

[@zhelyo_physics]

You're welcome!

[@alihazem1479]

1:15 why is the the North Down and South up while it should be the opposite

[@zhelyo_physics]

The magnetic South Pole is at the geographic North Pole. So the North Pole of a magnet is attracted to the south magnetic Pole and points towards it. Basically they are reversed.

[@modestusnwa3249]

at minute 32.00 why does the normal change ?

[@zhelyo_physics]

so the normal to each side of the surface is almost like a ruler that has been glued vertically to stick out of a surface. As the surface rotates the ruler will change its position. Hope this helps!

[@agyenfrempong2428]

30:04 there is no link in description

[@zhelyo_physics]

Hi, it's there you should be able to see it. It's got a heading Lenz's Law Detailed video.

[@Nobodyknows95123]

thankyou soo much

[@zhelyo_physics]

Anytime! Thanks for the comment!

[@Nomanqasim11111]

For what exam board is this?

[@zhelyo_physics]

Applicable to all. Always check with your spec for minor differences.

[@Nomanqasim11111]

@@zhelyo_physics alright thankyou

[@zhelyo_physics]

anytime!

[@Anzaedits]

Is all of this a part of 2023 syllabus please tell me

[@zhelyo_physics]

Which exam board exactly? I recommend googling the syllabus and using it as a check list. One of the best ways to revise. Whichever exam board it is, chances are it would be extremely similar.

[@Anzaedits]

@@zhelyo_physics A-level Cambridge

[@zhelyo_physics]

www.cambridgeinternational.org/Images/554625-2022-2024-syllabus.pdf syllabus is right here, it is virtually identical up to AC currents : ) Good luck revising!

[@archiesutherland6127]

thanks

[@zhelyo_physics]

Anytime!

[@randomuser12455]

is Motor effect in the ocr spec?

[@zhelyo_physics]

the spec doesn't call it the motor effect persay but yes the principle is there.

[@sergioh5515]

What's "A level" in your country? I keep seeing this term but does this mean college level or high school? I'm from USA, sorry

[@zhelyo_physics]

Sure, it's very similar to an AP course in Physics in the States, but non-calculus based.

[@soulsfan375]

which software is this

[@zhelyo_physics]

Microsoft Whiteboard

[@sivalingamrubendra4781]

Father( force)mother *magnetic field )child (current )is better

[@danteblamberti]

tysm

[@zhelyo_physics]

Anytime!

[@raihanaviv2495]

is this a part of as level?

[@zhelyo_physics]

Nope. A Level only.

[@Sea-qv4sd]

I love transformers

[@zhelyo_physics]

It's a pretty good film : )

[@sia1234]

@ZPhysics this channel is a good place to pun😭

[@naniidoodles]

I write my physics exam today ;-;

[@zhelyo_physics]

Good luck! You've got this!

[@naniidoodles]

@@zhelyo_physics Thank you!

[@ethanmay4385]

Who's here cramming the day before the exam?

[@zhelyo_physics]

Good luck!!

[@NahiliYami]

Wow

[@rishi2436]

so, who else is here preparing for tomorrows exams

[@shitisbrewing]

bold of u to assume i didnt procrastinate until 3 hours before the test

[@zhelyo_physics]

Next step: practice questions walkthrough: kzbin.info/www/bejne/hGnNhphnebWohNk Hope this is useful! : )

[@nadahere]

+++False! There are no 'field lines. Stop confusing lay ppl including many professional. What 'field lines' are, are 'magnetic equipotential lines' which is another way of saying 'lines of same strength within the field' or 'lines of same energy density within the field' [akin to isobars. And, since there is no 'flux' [as commonly defined' 'flux density is another misnomer' I've just demonstrated the gross misunderstanding academia has of physical sciences. What are the Properties of Magnetic Field Lines The tangent drawn to the magnetic field lines gives the direction of the magnetic field. The closeness or density of the field lines is directly proportional to the strength of the field. Magnetic field lines appear to emerge or start from the north pole and merge or terminate at the south pole. Inside the magnet, the direction of the magnetic field lines is from the south pole to the north pole. Magnetic field lines never intersect with each other. Magnetic field lines form a closed-loop. Field lines have both direction and magnitude at any point on the field. Therefore, magnetic field lines are represented by a vector. They denote the direction of the magnetic field. The magnetic field is stronger at the poles because the field lines are denser near the poles. Obviously mostly wrong. You are so full of yourself [self-important]! === I'm formulating the PARALLAX ELECTRIC THEORY which dispenses with the idea of magnetism which is but a historical anachronism, a misnomer, for matter having structured/organized polarity [positive and negative charge] via matrix/lattice/crystal/geometric-molecule/alloy units [depending on it's construction]. The concept of mag lines of force is another antiquated anachronism. In support of the aforementioned, all electric and magnetic fields are measured using the same equipment - magnets, coils, etc. ++++++So You Think You Know Physics. The Big Misconception About Electricity [Veritasium] - kzbin.info/www/bejne/mHmsmZqulttsgrs

[@masonsmith8220]

bad