# Calculating Surface Charge Density

1. Oct 6, 2008

### angryshoe

1. The problem statement, all variables and given/known data
The electric field strength just above one face of a copper penny is 2310 N/C.

What is the surface charge density on this face of the penny?

2. Relevant equations

Surface Charge Density = Q/A

3. The attempt at a solution

The only thing that I can understand is that surface charge density is equal to Q/A but that does not seem to help me with this question. What can I do for this problem?

Edit: I figured out how to do this problem.

Last edited: Oct 6, 2008
2. Oct 6, 2008

### granpa

I think you are meant to assume that the surface charge density is constant. you do know how to calculate the field of an infinite plane of constant surface charge density, right?

Last edited: Oct 6, 2008