Gauss's law, cylinder

ihatereg

Joined Mar 10, 2009
9
http://img404.imageshack.us/img404/4148/gauss3j.png (infinitly long)

$\Phi=\Phi_{0}(1-{r \over R}) {C \over m^2}$

What's the charge of the cylinder of length L?

I have done some calculations, but they were all wrong (checked by teacher).

nubelube

Joined Jan 3, 2010
16
1. What problem are you try to solve (and what are your assumptions? e.g. charge density)? What do your symbols denote (e.g. what are C and m)?
2. What did you do in your attempt to solve it? (and why, if it's not obvious)

lmartinez

Joined Mar 8, 2009
224
Are you attempting to find the electric field at a given distance due to a uniform line charge of an infinite length whose charge per unit length is given? ...

ihatereg

Joined Mar 10, 2009
9
C over m are units. It should be m^3 actually.

Anyway, question I gave you is additional one. The more important one is what is the electric field when r<R?

ihatereg

Joined Mar 10, 2009
9
C over m are units. It should be m^3 actually.

Anyway, question I gave you is additional one. The more important one is what is the electric field when r<R?

mik3

Joined Feb 4, 2008
4,843
C over m are units. It should be m^3 actually.

Anyway, question I gave you is additional one. The more important one is what is the electric field when r<R?
When r is less than R the electric field is zero.

mik3

Joined Feb 4, 2008
4,843
You can assume an area inside the cylinder and calculate the net electric flux throught it.