Magnetism 6: Magnetic field due to current

[sprattysy]

you have some great stuff here

[shellybirdy]

This is a great video

[mihiro271]

one question

is there a symbol x in circle denotes inwards whiole the . in circle denotes outward curent

[superandy456]

On the website this is embeded on its only in 360p but here its only in 240p it makes no sense. :S

[arunk123456789]

nice

[Titaniumgoblin]

MATE YOU'RE AN ARTIST, PHYSICIST AND MATHEMATICIAN HAHA

[zainuu163]

Man!! I Love Ur Blue Hand.....Seriously

[darkshadowz1994]

I have a TI-86 silver edition PLUS :O only $99.99 (plus tax)

[dtorti4]

dude i have to say, i loved it, i actually knew this stuff but you make it so easy to learn, appreciate the video a lot.

[urdouchbag]

a little explanation to the formula B=u0 i /2 (pi) r....

using gauss' theorem's equivalent in magnetics..(Ampere's Circuital Law)...

B.dl=u0.i in gauss law we had..E.dS=Q/e0

so in this case..

B.(2(pi)r)=u0.i dl=2(pi)r for a circle(circumference)

we have to find B...

B=u0.i /2(pi)r

[Arzenimus]

Hahahaha "These are the veins on my hand" killed me! xD

[gagikRLHS]

TI-85 is so last decade

[musicdata92]

the exact value of "mu" for a infinitely long wire is (4*pi)x10^-7

[TheOneToxic]

can i just say you are really good at art considering your using a tablet which are hard to use XD

Lovely lessons!

Oh, im going to make the hand blue....very professional ;)

Thanks!

[mustafahashimkhan]

What is this "mu" that looks like a "u'!! you rock sal

[Ardi1589]

what is the name of the equation/law that you give in the video around 4.45 which regards the magnitude of the magnetic field? is that called the Biot–Savart law?

[cullum14]

@Ardi1589 i think it is

[cullum14]

@Ardi1589 yeh i think so

[MindP0w3r]

i love you man

[Darathexplicit]

whhatt the. your hand looks retarded at the start then somehow it turns beautiful O.o

[dalcde]

Seems like a physicist really needs his/her right hand.

[asetenta]

if the world around a through the wire travelling electron is symmetric, based on what does the god of magnetism choose the direction of the magnetic field???? i know its determinated by the hand rule, and the direction may be a convention, but why can there be a direction thats asymmetric anyway?

[cheese0cake]

Is the current in your videos conventional or real current?

Does the right hand rule change to left hand rule when its real current?

[GTSRBOY]

@cheese0cake Right hand rule relates to Protons, conv current deals with protons. If you use left hand rule, your dealing with electron flow

[nornd]

NONSENSE

[guitrkill3r]

This guy draws hands like Michaelangelo created David.

[423Mark]

How do we know which way the current is flowing? Does it flow from positive to negative or the other way around?

[RADHE143]

positive to negative terminal of cell or battery

i.e opposite to the flow of electron

[cheese0cake]

@423Mark There's two different type of current. Conventional current and Real current.

Basically, physicians some time in the past had to answer the exact same question you just asked, what direction does current flow?

They had to take a 50/50 guess and said that current is a flow of positive to negative, i.e. the flow of positive charge. The problem is, they're wrong.

Nowadays we know that current is the flow of negative charge and flows from negative to positive.

[Mattprole]

If I remember correctly mu is (1.26 ee - 6) T m / A.

[mfleuren]

µ0 = 4pi E-7

[squarkman]

Does the intensity of the mag field associated with electron x, move along the wire with electron x? So it would be like a spherical field force moving a foot with every foot of distance moved by electron x?

But if electron x causes a mag field, this field is not affecting the electron field in the previous second so it seems like it creates a huge undefinable mess of electron fields that cannot be rigorously defined.

[SecretAsianMan7]

@squarkman There are essentially a whole bunch of elections moving in a line, so it forms a cylindrical magnetic field.

[squarkman]

Does the shape of this magnetic field that disipates based on the radius from the moving electron, form a sphere by adding up growing and shrinking concentric circles?

[jhonma1]

Spectacular explanation

than you.

[Max11551]

Sal could you (or maybe someone else who knows) tell me where I can get that TI85 emulator? Is it commercial?

[abukrrr]

Why don't you just Google it.

[Max11551]

Cool. Had this in physics class a couple months ago, now it makes even more sense.

[quitejaded]

Damn, I discovered your videos in the middle of the summer semester and I wasn't able to catch up. I just finished my final yesterday. I wish I found you sooner. But atleast I'll have you for Calc2, Economics, and Linear Alebra, right? RIGHT? :(

[FarFromEquilibrium]

Sal I cant wait for your 5 part video on integrating Maxwells wave equation!