Question

Two concentric conducing spheres of radii 4 cm and 12 cm are given equal but opposite charges of 6 x 10^-8C. How much energy is stored in the system?
How would I go about in beginning to solve this problem?
bobpursley
I think I would solve for E between the spheres using Gauss Law. Then, you have E as a function of r, and can integrate to find stored energy.