Homework Help: Calculating energy of electric field

1. Jun 16, 2010

planesinspace

1. The problem statement, all variables and given/known data
(a) Consider two concentric spherical shells, of radii a and b. Suppose the inner shell
carries a charge q and the outer shell carries -q (both of them uniformly distributed
over the surface). Calculate the energy of the electric field in this configuration.

2. Relevant equations

3. The attempt at a solution
I was just wondering if this would result in a net charge of zero, thus no electric field? And consequently no energy?

2. Jun 16, 2010

hikaru1221

There is no electric field outside the shells and inside the inner shell, but how about the space between the shells?