1. The problem statement, all variables and given/known data I have a solid, insulating, finite-thickness spherical shell (inner radius a, outer radius b). It's uniformly charged with a total charge of Q. i'm looking for the electric field E, "everywhere in space, including points outside and inside the spherical shell" Also, i'm looking for the electrostatic potential of the inner and outer surface of the shell 2. Relevant equations E = (1/4pie0)(Q/r^2)r 3. The attempt at a solution I'm pretty much lost on this problem.