A nonconducting sphere of radius r0 is uniformly charged with volume charge density ρE. It is surrounded by a concentric metal (conducting) spherical shell of inner radius r1 and outer radius r2, which carries net charge +Q. Determine the resulting electric field in the regions (a) 0< r < r0 (b) r0< r < r1 (c) r1< r < r2 and (d) r > r2 where the radial distance r is measured from the center of the nonconducting sphere.