1. The problem statement, all variables and given/known data A sphere, which is hollow, has an inner radius (denoted x) and an outer radius (denoted y). The sphere does not conduct. It has a charge of 5 C distributed uniformly throughout it. 1) What is the charge density by volume in the body of the hollow sphere? 2) How much charge is enclosed in a gaussian sphere of radius x < r < y? 2. Relevant equations (4/3)(pi)(r3) is the volume of a sphere with radius r. 3. The attempt at a solution I know you divide the charge by the volume of the sphere. Since the sphere is hollow, can you assume that the 5 C of charge are distributed in the hollow part too, or only on the edge? My instinct is to calculate the volume using radius y, but I'm not sure.