Magnetism 5

[soumyasayujya]

Physics s soooo intresting.......not like the way my teachers make it seem like oly brainyheads wil understand!!!......i understand it tooo!!.... :P

[Vintexen]

I use to think the X meant the arrow was coming at you and the dot meant it was going away, then I took an arrow to the knee

[zainuu163]

Man I Love This ♥ All I Do is Watch These videos and Iam Able to do all the Numerical Problem Instantly .....

[griftorifto2]

@kkurian10 All the same rule. But different hands with different fingers representing things.

[MrBlazzzzer]

(serious explanation)....... ANYWAY...my time is up!! LOL

[backyardbeachbum]

down with evil physics professors! all we really need are these youtube videos.

[kkurian10]

@khanacademy

Dear Drs. Khan,

Could you please elaborate the left hand rule?

Where you applied the right hand rule in this video,

We were taught to use the left hand rule.

I live in the Netherlands. This could be the reason for these differences.

Thank You So Much!

[Shuvraa]

@kkurian10 left hand is for electrons, right hand for protons

[greenxcastlexcrasher]

I thought you were wrong when you were drawing the direction of the force... Then I realized I was using my left hand.

[PianoSkills101]

Great vid.

[gagikRLHS]

ohhhh i just realized i was using my left hand. lol

[duytam94]

I'm gonna be honest with you. I learn more from 10 minutes of your videos than I do from a week in my class with my Physics teacher.

[TheOneToxic]

Lets give it up for the most awsome person on youtube!!!

No not me ;)

YOU!!!!!!!

Thank you soooo much, i DID have problems with magents, dont anymore :P

[enki7777]

of course he is better than your physics professor... that is the whole point of the internet. we can sit at our computers and find the greatest minds in the world.

formalized education is a narcotic worse than opium. our society needs to find a new babysitter for our children until they are 18 or just throw the babysitter away.

[sibghatullahdad]

@devs604; and let me tell u he is 100000000000000000000000000000­000000000000000000000000000000­000000000000000000000000000000­000000000000000000000000000000­000000000000000,better than my teachers they speak urdu and dont get a word cause understand english better but though sindhi........... well thanks khan uncle................

[solakaboy]

@devs604

same i fucking hate my physics teacher, he cant teach for shit. lucky i found these videos. thank you khan.

[DefenitionBlack]

@devs604

my ELA teacher: an analogy is a thingy used to describe another thingy.

[Kerpal2253]

I really dislike the right hand rule. I think it's a subconscious mechanism for those who already understand the material. Their are a number of permutations you can run with and a bunch of them are wrong. I just tried one of the commentators method and it was wrong. If b is a vector {x,y,z} = {1t,0,0} or {0,1t,0} IDK then its not 90 degrees to the wire. The whole dot/X diagrams confuse me.

[DefenitionBlack]

@Kerpal2253 yea it's a real bitch to learn, but i can tell you it's totally not impossible.

[dewi20]

brilliant

thanks :)

[purplepick1]

im so confused... usually i get ur videos but not magnetism...

[boeing747200lr]

@purplepick1 Dont worry. Sal explains 100x better than any textbook or an average physics teacher. Just start again form video 1. Dont lose patience. I am sure u will get it.

[aaetheridge]

you are so much better than my teacher :) thanks

[wcsummer]

I'm a little confused. According to Wikipedia, the thumb is Force, index finger is mag field, and the middle finger is the current. This follows the FBI rule. In this video, the current and field fingers are switched.

[jccarbunkle]

Because electrons are moving in the opposite direction of current. You can use a "left hand rule" for negative charges and see that its the same as what sal did.

[boredpeople100]

wiki is probably explaining the curling method - there are various ways to use the RHR. Either that - or someone screwed wiki up. (anyone can edit it you know?)

[wynhons]

@boredpeople100

haha, nahh, the curling right hand rule kinda gives you like a "thumbs up" shape, not the one used in this video left or right hand.

[Kaosdeamon]

There are more than one versions of the same rule! So long as the one you chose works and you can rember it, it dosent matter which you use!

I use the left hand rule, with my middel fingure as current, index is magnetic feild direction and thumb as direction of force.

[wynhons]

@wcsummer

the FBI rule applies for the Left hand. Sal is using the right hand rule:

thumb = force,

1st finger = velocity of proton

2nd/middle finger = field

it's just the same idea! haha

but check it out! if you apply the FBI rule, your force (thumb) still points upwards, just like the right hand rule Sal used!

[speckhard2]

@wcsummer its the same just flipped about, both of them work (:

[atrok2]

lol "if an arrow was shot at you, you would see the tip of the arrow and maybe a circle around it"

no... i would see my life flash before my eyes

[wisigothx]

@atrok2 haha, smooth.

[Artofoov]

@atrok2

Or u can extend your right hand, and swipe your middle finger perpendicular to the arrow and defect it like a bad ass ninja.

[somethingan]

what do they mean when a negatively charged go from lower potentials to higher potentials? and that the direction of current is opposite to the direction of electron flow?

[takemeway]

Go to The video : Circuits (part 1) you find the explanation of your question.

[squarkman]

So what does this force do? Doe it move the wire? Does it affect the current in the wire? Does this force affect anything. What kind of force is it? It would be great if you described what this force does. Force tends to do work. Thx

[vicomelgoza]

hey do you do organic chemistry as well. im struggling with mechanisms and IR, NMR, and mass spec. just wandering thanks