Lenz's Law | Magnetic forces, magnetic fields, and Faraday's law | Physics | Khan Academy

Courses on Khan Academy are always 100% free. Start practicing-and saving your progress-now: www.khanacademy.org/science/p...
Lenz's Law - seeing that the magnetic field induced by a current induced by a change in magnetic flux (Faraday's Law) counteracts the change in flux.
Physics on Khan Academy: Physics is the study of the basic principles that govern the physical world around us. We'll start by looking at motion itself. Then, we'll learn about forces, momentum, energy, and other concepts in lots of different physical situations. To get the most out of physics, you'll need a solid understanding of algebra and a basic understanding of trigonometry.
About Khan Academy: Khan Academy offers practice exercises, instructional videos, and a personalized learning dashboard that empower learners to study at their own pace in and outside of the classroom. We tackle math, science, computer programming, history, art history, economics, and more. Our math missions guide learners from kindergarten to calculus using state-of-the-art, adaptive technology that identifies strengths and learning gaps. We've also partnered with institutions like NASA, The Museum of Modern Art, The California Academy of Sciences, and MIT to offer specialized content.
For free. For everyone. Forever. #YouCanLearnAnything
Subscribe to Khan Academy’s Physics channel: / channel
Subscribe to Khan Academy: kzbin.info_...

[@goverbeek]

I am very impressed by the right hands that you drew.

[@blankwith]

me too lol :)

[@ptawethe2nd]

Same lol

[@Stephanie-xo2ce]

Greg Overbeek me too lol

[@SoulReviving786]

Yup he is a star

[@stummstefan9735]

It was awsome but the first one looked somewhat like a pigeon with a backpack.still awsome 👍

[@abhiaerospace]

"Let me find a nice color for the current". Love you Sal.

[@PerrinTan]

Perfect voice, perfect drawings, perfect colours, PERFECT EXPLANATION

[@VarunSingh000]

+Perrin Tan He's been perfecting this art since 2006.

[@adansilva6851]

love the captitals at the end lol

[@cohensstopmotion8513]

his voice annoying afs

[@EmpyreanLightASMR]

@@adansilva6851 I know, he went from a 4 to an 11 in eight words

[@christiangutierrez7193]

when you come to Khan academy wanting to learn physics and get an art lesson in the process

[@faroteur96]

pays $$$ for college. comes to youtube to learn for free.

[@VeritasEtAequitas]

Several ivy league universities make courses available for free, but doing so gives you no diploma, nor does KZbin. Employers will demand that as proof.

[@poundingsaturday7388]

$25k a year along with a $200 textbook that just leaves me confused and having to come to youtube to learn even the most simple concepts. whatever gets me a degree i guess.

[@jared5684]

Pays 0$ to learn physics as a general education requirement at a public high school... Comes to youtube because he's drunk on a Friday and doesn't pay attention in class.

[@greymelon7431]

U r learning this in university?

[@DaelinZeppiTheComputerGamer]

Unfortunately no "University of Khan" degree at the end of it.

[@yashjagtani907]

You are a F.....G Legend, What my teacher couldn't teach me in 2 months, you taught me in 6 minutes. Keep up the awesome work.

[@darkdelta]

Just saw this, and in my mind it's the graphics plus the excellent explanation that drives this home.

[@WfrArcPol]

4 teachers/lecturers explained this to me and I didn't get it. This video makes me finally understand the law. Why am I even paying for uni

[@MonkeyDLuffy-xr4fl]

Legit, uni made me hate physics :(

[@devilmansanchez]

Excuse me, is this uni material only? I say it because I feel bad for not remember learning any of this in school.

[@MonkeyDLuffy-xr4fl]

Dord Abacot No, it's school material as well. It's just I didn't do physics in school, but decided to do it in university. Initially, they teach you basic physics (not extremely basic...), but then get onto the real thing. So this is the basics we were learning.

[@alexmanbeck]

a current through a wire creates a magnetic field in the direction of the RHR From Faraday's law, changing magnetic flux will induce a current. So if you increase the magnetic field, you increase flux and create a current. The direction of that current has to create a magnetic field that goes in the oppostite direction as the change otherwise it will increase infinitely

[@sadiqrahman8723]

What I am learning this in Grade 10 in my country😖

[@ananya.a04]

This was such an amazing video! First time here, but I understood with an unexpected ease since Physics is my Achilles’ Heel. Thank you so much sir 😊🇮🇳

[@Amrdestroyer]

Cool, please keep on making physics videos' sir! After you finish electromagnetism, could you please start to explain quantum mechanics? Please?

[@mlc1503]

I've been stuck trying to understand this law for a couple days now. I didn't know that a 6 minute video could make me finally understand it. Thank you!!! (Also the hand drawings are pretty good!)

[@kajalk141]

How could he have so deep understanding of almost all disciplines? Huge respect and love.

[@AmandaMagana]

thank you!!! -UCLA student with physics final in two days and still doesn't understand lenz's law

[@Yashraj100x]

How did you get into UCLA then?

[@tfw_e8370]

@@Yashraj100x do you go to first grade to learn to add or do you go already having learned how to add only for them to teach you again?

[@Yashraj100x]

@@tfw_e8370 she said can't understand not can't remember

[@tfw_e8370]

@@Yashraj100x people come to these videos to learn/increase their understanding of topics, so what are you getting at

[@gurushajuneja1946]

Infinity loop of increasing energy 😂😂dude nice explanation . Thanks a lot sal . It does a lot for students like us

[@SaiAbitathaDUCIC]

I wish the law of conservation of energy could be violated somehow

[@Stella-hx2rn]

I've been coming back to this video so many times! No one has explained Lenz's law better. Thank you so much!

[@ecarrasco2635]

love how you explain the right hand rule and draw everything perfectly #khanuniversity #howigotthroughcollege

[@beawesome5090]

Khan academy you always give me something much better than my expectations THANK YOU 😌 ☺ KEEP GOING 👍👍

[@davide2555]

An amazing explanation.. thank you a lot to make me understand that law, I'm so grateful!

[@rrennnerr]

These videos will be clutch later this year during my first year of college.

[@faraz6912]

I have a quiz in the morning and my mind was about to explode i was stuck at the lenz's law, this video got me literally goosebumps the way he taught it. I never knew it was that easy. Thank You sooo muchhh for this effort!!!

[@flayy5750]

The hand looks real artistic ^^

[@jamesvaughan748]

Thank you so much! With online classes, some professors have posted mediocre slides which were OBVIOUSLY meant to create class discussion, but since there's no class, there's just incomplete lessons.

[@MrKillerbunny1981]

Think this is the second one i have seen on Laws, kind of into that. Thank you for the free content.

[@singerdream4481]

thank you VERY much. khanacademy is always so helpful after everyone fails

[@hassanmehedi9903]

This is a very clear lesson. I just loved it. Thankyouuuuuuuu

[@kahanikaar_sa_kavi]

Seriously, simple presentation and on point explanation made it very intuitive. Thanks a lot !

[@jimmysmith9462]

My professor doesn't post lectures for my physics 2 class, he just assigns two chapters a week and doesn't answer emails. Khan Academy is literally teaching me more than I learn in college.

[@justanormalman2972]

Thank you, now I actually understand Lenz's law and not just some words from a book.

[@jessicamoley123]

Thank you so much for this, it makes so much more sense now.

[@JihadAlAnsari]

I finally understand. Thank you.

[@AslamKhan-ky8pg]

thanks sir , I will never forget that you have said " this is the violation of law of conservation of energy " and from this statement I have understood the lanz,s law very successfully.

[@ruposreechakraborty5959]

its an interesting explanation

[@amyfu7387]

This is by so far the best lenz's law explained. Thank you sooooo much!

[@gabrielware2777]

Years of studying and no one could give me the explanation youve given. Thank you very much

[@biswarajnath5782]

simply Perfect....Thank You so much

[@compumishra8905]

I truly understood the Lenz law today..thnk u sir.. Impressive explanation

[@erickcastellanos6814]

Beautifully explained. Best i've seen and great visuals! Thank you

[@BoonkiCoC14]

I just love this guy. How is it possible that I understand this but not the book?

[@DaelinZeppiTheComputerGamer]

Learnt this at Sixth Form College and twice at university with different schools (mathematics and engineering). Despite that, this is the best and simplest explanation I have seen.

[@Tombalino]

Sal Khan is simply a beautiful teacher. Thankyou

[@fakhrizaidan6718]

Thank you finally i found an excellent explanation

[@krishnarajthadesar6783]

amazing video i got it in seconds. Great !!!!! this is what u call an EXPLANATION

[@IIxLordOfDarknessxII]

Beautifully explained, thanks!

[@mohieddinekhaled1619]

Bruh i was searching for this exact explanation for 3 years now. I always took lenz law for granted but i now know the physical reason behind it. I sleep in peace now

[@AbdulKaderAbdeenAgha]

This video is a piece of art, this is legit explanation, don't know how to thank you.

[@ShubhamSaraf30]

superb explanations. If you could simplify the LENZ'S LAW (the statement) and provide that to us, would be helpful.

[@AdiCherryson]

I really appreciate your videos. Nevertheless there is a small flaw in reasoning in this one. Even if a generated current would increase magnetic flux it is not said that it would cause infinite gain. That is because a _change_ of flux is what inducing a current not a strength (density) of it. So you could have very strong externally generated flux with just a little change over time. This way flux induced by a current would be negligible. Another thing. In the moment when you will cease to increase external flux the current will drop. When a current drops induced flux also drops. Drop in a flux means generation of a current in a reverse direction.

[@makhanlalkar3111]

Thank you sir!!! You have increased my confidence in Physics. People always try to demotivate me but you have motivated me to persue my favourite subject.

[@benjamincordes207]

Wow I waited so long for this! Thanks I really missed some Khan Academy videos for electromagnetism. You're the best!

[@sciencegeeks1370]

Thanks a lot. Really helped me understand Leno’s law better than my grade 12 physics textbook.

[@purekhankirchala3907]

very easy to understand.

[@anusham1045]

The best possible explanation!

[@johnlevin6554]

Woow this is really helpful. Thank u. And u draw very good! Impressive.

[@EmpyreanLightASMR]

I think I want to add that for some reason "the conservation of energy" (which is mentioned at 5:00) isn't said by teachers when teaching this concept. It took multiple youtube videos before I finally heard that phrase, and I figured it was the case, but still. It helps to know *why* Lenz's law is working. I'm sure the textbook says it, but those things are written by out-of-touch people.

[@jaimeesquenazi5591]

I never comment on KZbin videos, but this was insanely helpful. Thank you Sal!

[@osmanahmed6418]

Awesome your redoing the Physics playlist. The most important science ever even more important than math because its ground in reality and not abstraction.

[@stargazezz]

It's taking me a yearrr to understand this concept... Idk how I will do on my physics exam tomorrow 😥 And this actually helps me understand the basic concepts Thank you :)🙏

[@sanehsaini7847]

Thank you sir couldn't understand anything initially but after seeing this i think i have almost mastered it. Thank u so much

[@adrian.ts1]

I go to school every day to waste 2 hours listening to my professor whose so bad at explaining then go home watcha 6 min video that explains in a very simple and fun way bliss, you man

[@chandrarishabh]

Apart from being a great teacher, he is also a good sketcher. Nice little right hand illustrated Sal! XoxO

[@sammih7938]

At 4:27 when he draws the arrow of the magnetic field due to the current (purple one) . Why wouldn't it be drawn upwards since using the right hand grip would show your fingers curling upwards?

[@nickdicerbo6361]

Can you just make a Khan University? You guys explain this stuff so much better than my textbooks and professors...

[@Serene0910]

You study these in universities? I'm not in university yet, I've to study these so that i can enter a university 😅

[@gregorykarimian3813]

This is one fo my favorite laws. Its a fun law to learn about. I always think about lenz’s law being best friends with conservation of energy law because it defend it. Lol

[@pirates8228]

The energy in his voice is never ending... He's violating the law of conservation of energy!!

[@MegaSairahul]

Sir i started my physics high school with your videos but couldn't end my high school with them as they were not sufficient . like i learnt newton's laws but could not learn semi conductors from your videos. Sir i hope that you concentrate more on the physics videos as physics has to be more conceptually understood. i beg you sir please

[@TechnoBots1]

You explained this WAY clearer in 5 minutes than my phsycis 2 professor did in an hour.

[@CesarAngeles28]

Thanks for this, one of the best explanations ever!

[@abuabdullah9878]

Beautiful explanation. Thank you.

[@adi_barman_]

On point! Got it finally 😀

[@technicalrajashish]

thanxx to clear my concept

[@CorruptedAngelK]

ugh sorry im having to ask this: but how does the right-hand rule for counterclockwise and clockwise on the left-side coil on clockwise picture (4:24) point at the same direction (therefore same hand gesture) but counterclockwise produce an additive force but subtractive force for the clockwise one?

[@EnteRaro19]

As I understand, if the loop of wire moves in the same direction as the vectors from the sationary magnetic field, it means the wire never cuts any magnetic line, thus no current should be generated. Could you pleas explain what am I missunderstanding? Shouldn't the magnetic lines be horizontal rather than vertical?

[@420daganjafarmer]

Yay, more physics videos!

[@poundingsaturday7388]

thanks, this helped me understand the concept. also you can draw some bang up hands!

[@GreAse0MonKey27]

2:53 That energy !! Love it :))

[@yashodadahale]

Very Beautiful explanations!

[@barathkumar2877]

Best explanation of lenz law ever before I was so confused

[@LearnMathsFree]

Thanks for the video!

[@emilyycchow]

this makes so much sense thank you T.T saved my final exam mark

[@prajitsharma1921]

That's The Best Explanation PLEASE KEEP IT UP THANKS FROM MY BOTTOM OF HEART

[@baitullah5622]

Awesome

[@yuanxiang1979]

Can’t thank you enough!

[@pragyasaini27]

Great explanation and diagrams too 👍🏻😁

[@PatriciaN1202]

Best video on lenz law on youtube. Great! Elegant. Ah ha 🙌

[@ennachi7048]

Perfect explanation and thank you so much 🔥🔥🔥🔥🔥🔥🔥🔥

[@tomeandbansho4911]

It makes everything so much easier

[@laniel9007]

This helped me understand

[@hassanayad4807]

you're best than my teacher....thanks you

[@nghubert7236]

Great video! Thank you

[@pistolpete349]

Actually the Right hand rule was spot on., Thumb in direction of current flow curled fingers show magnetic field imposed cw or ccw. Lechatelier's Law= For every action there is an equal and opposite reaction.

[@demonking1101]

i am confident that this is the best teacher voice i ve ever heard

[@manishpingale6558]

Perfectly explained

[@OldSchoolNoe]

For automotive, just know that using a clamping diode will help dissipate the large voltage spikes after the circuit is opened [In coils and electric motors].

[@itachi6336]

but the flux lines generated by the wire is curled so how do they oppose or contribute to the flux lines pointing up ? 2:20

[@Ayann999]

I can't get over how perfect your right hand drawings are!

[@gf8qu]

Best explanation of lenz's law

[@momzitoari9354]

Thank you sir.

[@user-cd8yi4dk6p]

Omg omg omg you'r the best !!!!! i finely got it !!!!

[@TanZ337]

That right hand drawing amazes me every time

[@nanditha6517]

THANK YOU!! 🙇🙇