Magnetism 3

[verymetal86]

ouch !

[speedlord2]

Easier Right hand rule: Thumb points with the direction of velocity or current, the rest of fingers point with the direction of the magnetic field. Your palm will point with the direction of force (downward in this case.) [:))]

[chamchamxl]

with so much finger talking am surprised no one made a joke about it :/

[luvlycokee3]

I don't get it

[farzadjvpq]

I think the direction of the force is upwards

[ashalansky]

Electron--- left hand , Proton --- right hand

[Rubenrawalisampang]

@ashalansky yeah negative and positive !!

[bombardo12]

I find it easier to use my thumb for the velocity, my other four fingers for the direction of the magnetic field and whatever way my palm is facing is the direction of the force

[jimmyti9cer]

I am charged! I LOVE PHYSICS!!!

[mrhansenable]

"how does that magnetic field know how fast you're going?" you just blew my mind !

[igankyoumaybe]

Is this High School Physics?

[jimmyti9cer]

@igankyoumaybe no, you may learn this in college fundamental physics courses, this is class you take after you have had two or three calculus classes. Now an advanced placement class in some high schools may offer this level of physics but most dont, I know my high school didnt even for people that were really good in calc.

[QadeemSamir]

@jimmyti9cer for me, this is standard grade 12 physics

[Representt]

10:25 - 10:39

Possibly Newton's third law? 

[couscousable]

I am confused to why you used right hand rule and nt the left hand rule. As it seems to me, left hand rule works just as fine.

[bombardo12]

@couscousable left hand rule works if it the charge is negative

[Philblert1]

If you are watching this take a look at Philblert1, Unified Field Reality and Algebra solves uft.

[manudhan]

i think this is wrong cuz thumb is ur velocity, and inderx finger is the magnetic field, and middle finger is the froce, so if we do this question according to this then our force willl go up not down

[Joeylumadip]

Sorry didn't have space. But if any want to comment on this or prove me wrong you can. What I determine is that the direction of the force will go up. So as you see the screen, it would appear the force would go away from you or towards the ceiling.

[Joeylumadip]

I believe using the right hand rule with the thumb representing the direction of velocity, your fingers as the direction of the magnetic field (magnetic field lines) and the force direction coming out of the palm of your hand would be different from the direction of the force which you determined was coming towards us. The right hand rule applies to an electron but when you use a proton, the direction of the force is determined by using your left hand or by using the back of your hand.

[gagikRLHS]

10Q very much

[LOCUkDk]

The arrows popping out looks like breasts...

God Bless You(:

[aznwilly211]

how do you arrange your hand like that???

[Rastaman12122020]

u have 1 dislike. I guess someone dosnt like brown skin

[asetenta]

what i find scary is that despite the fact that your set is SYMMETRIC to both sides of a plane (defined by the magnetic field arrows and the initial velocity), the force is produced perpendicularly to the plane in one direction, in a very ASYMMETRIC way. how the hell can that happen??

[nhmllr725]

@asetenta But it's not symmetric- the vectors are moving out at us, the south ends go behind the plane of he screen and the north in front.

[Philblert1]

@asetenta sin/cosine = tangent, at 45 degrees or pi/4 radians everyone is equal on the plane.

[morbidpancakes]

I thought it was electrons that travelled through the magnetic field... Unless it's a stripped H atom? I'm confused?

[rinwhr]

I just broke my fingers lol

[haloapa]

My teacher teaches my Fleming's left hand rule...

[giriisindahouse]

@haloapa dude that's for the movement of electron if you look on the video carefully towards the end.

[haloapa]

@giriisindahouse he just say for electron, you can still use Fleming's left hand rule. only that the force you get must be fliped 180degree.

[Yohannesiscool]

u are the man.

[onlyAerik]

Who cares if your hand is brown in real life. With the colors you had in your screen, a bright blue color would've popped best.

[Extralucas]

@onlyAerik Brown was okay.

[MBC022]

well this beats having to read the book lol

great videos!!

[mo92us]

Nice drawing of the hand!!

[mfleuren]

very clear, good video

[infidelguy]

Oh well. This is way beyond me. I was hoping for something much simpler. Math is my Achilles heel. I just freeze up when I see math. :(

[ajskilton]

it's the only language for physics we have and I can tell you that Salman makes this very clear if you understand basic vectors otherwise it's like trying to make a sandwich without bread!! tip, 'go buy some bread!'

[mackenzie235]

No you're not dumb ellieuk. you are talking about Flemings left hand rule and that is the one to use for a force on a wire, ie. the motor effect. but Flemings rules were intended for use with conventional current. contd.

[ellieuk2002]

Hi.. either i am being totally dumb.. but shouldn't you use the left hand rule? The proton is positive, therefore using conventional current. Thumb = force, index = field, and second = current. Using left hand rule, index fingre points out the page, second finger to the right, and force down...?

[esgalrill]

That's right. There are several interpretation of this rule. In fact, they all show the same. I use the left hand rule, where magnetic field points into my open hand, all for fingers=the direction of current or positive charge, thumb=Lorentz force

[esgalrill]

Here he uses a right hand rule as for cross product of vectors - simply math.

[mackenzie235]

No you're not dumb ellieuk. you are talking about Flemings left hand rule and that is the one to use for a force on a wire, ie. the motor effect. but Flemings rules were intended for use with conventional current. contd.

[stanvideo]

Very, very helpful. Helped me in my physics class. Thank you.

[maybeok1]

what about the right hand rule?

[danemichaelandersen]

Sal's the best! Not a bad sketch artist either!

[MRJerrod410]

Is there an explanation for why a magnetic field exerts a force perpendicular to the velocity of the charge?

[AnnManMS]

Force is the cross product of the velocity and the magnetic field and is perpendicular to both of them. This comes from the definition of the cross product.

[tnguyen603]

nicely done!! even though I know much of this already!!