A nonconducting shpere of radius r2 contains a concentric spherical cavity of radius r1. The material between r1 and r2 carries a uniform charge density ρE (C/m3). Determine the electric pontential V, relative to V=0 at r=∞, as a function of the distance r from the center for (a) r > r2, (b) r1 < r < r2 and (c) 0 < r < r1. Is V continious at r1 and r2?