A non-conducting sphere of radius R centered at O contains aspherical cavity of radius R’ centered at O'. Let d be thedisplacement of O’relative to 0. Throughout the sphere, there is auniform charge density rho_0 (except inside the cavity, which isuncharged). (a) Use the principle of superposition to write down anexpression for E(r) everywhere. (b) Repeat (a) for the electricpotential b(r).
