(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] Gauss and E-Field

1. The problem statement, all variables and given/known data

http://img443.imageshack.us/img443/9452/eletroof9.th.png [Broken]

My main problem with this problem is finding the electric field at Point 2 (P2)

2. Relevant equations

3. The attempt at a solution

I derived the electric field using Gauss's Law for a cylindrical charge distribution.

[tex]E (2\pi rL ) = \rho(\pi r^2 L) / \varepsilon_0[/tex]

[tex]E = \frac{\rho * r}{2\varepsilon_0}[/tex]

So I found E at P1 to be 0 V/m

Now onto finding E at P2, according to my equation, it would seem that E is 0, since the radial distance is 0, however that seems strange to me, if the point is at the surface of the charged volume cylinder, wouldn't there be some charge, I know it's not a conductor but still I would think that there would be some charge?

And since I've got it all out here, is the E field at P3 just the integral [3/2L, L/2] of a charged disk?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Gauss and E-Field

**Physics Forums | Science Articles, Homework Help, Discussion**