A spherical conducting shell has an inner radius R1 and outer radius R2 There is a charge Q1 spread uniformly on the inner radius THere is a charge Q2 spread uniformly on the outer radius what is the potential for a distance R1<r<R2? What is the potential for a distance r<R1? Since the potential is continuous between surfaces, the potential the outer surface and inner surface must be equal at the boundary I'm not sure where to begin with this question. I was thinking about treating the surfaces as point charges but we cant do that in this case since we want to know the potential between the shells. Any advice?