Physics electric field problem

1. Oct 9, 2008

kirakyoumou

An infinitely long sheet of charge of width L lies in the xy-plane between x = - L/2 and x = L/2. The surface charge density is n. Derive an expression for the electric field E at height z above the centerline of the sheet. (Assume that z \ge 0.)

Express your answer in terms of the variables n, L, z, unit vector k, and appropriate constants.

2. Oct 10, 2008

gabbagabbahey

What have you tried?

3. Oct 10, 2008

kirakyoumou

I don't even know where to start. My book only gives explanations for FINITE planes. :( I know that I'll have to use an improper integral but...idk anything else.

4. Oct 10, 2008

gabbagabbahey

What is the expression used to calculate E for a finite surface?