# Finding the electric field of following setup

1. Jun 16, 2011

### brainslush

1. The problem statement, all variables and given/known data
Assume two perpendicular planes one with charge density $\sigma$ and the other with a charge density $2\sigma$. Find the electric field.

//|
//|
//|
//|
$\sigma$ |
//|
_ |__________________
//|////// $2\sigma$///////////////
//|

2. Relevant equations

3. The attempt at a solution
I got a question. Can I assume that the planes are infinitly long, specially close to the origin? In such a case, I could apply the Gaus-law.

Last edited: Jun 16, 2011
2. Jun 17, 2011

### Staff: Mentor

Hi brainslush. By definition a plane is of infinite extent. If you know the result for the field due to an infinite plane of a given charge density, then you're (almost literally) halfway there!