Why is the Qenclosed zero if there's a charge inside the shell? 1. The problem statement, all variables and given/known data A solid conducting sphere of radius a is placed inside a conducting shell which has an inner radius b and an outer radius c. There is a charge q1 on the sphere and a charge q2 on the shell. Find the electric field at point P, where the distance from the center O to P is d, such that b<d<c. There's a diagram which shows: radius of solid conducting sphere = a inner radius of conducting shell = b outer radius of conducting shell = c O is the center from which all radii are measured. 2. Relevant equations Flux = EA = Qencl/εnaught A = 4∏r^2 3. The attempt at a solution E = Qenclosed/ (εnaught*4∏d^2) I have the solution already, which is E=0, but I don't understand why the charge enclosed is 0. I understand that the charge on the shell spreads to the outer surface of that shell since it's a conductor, so that charge wouldn't be enclosed in the Gaussian sphere with radius d. I don't get why the charge on the solid sphere doesn't count, though. In the problem before it, the question asked for the electric field at a point in between the solid sphere and the spherical shell, and the answer was kq1/d^2, which means that in the space between, the enclosed charge is q1.