E VirtualDv 4. A spherical shell has an inner radius a and outer radius b, as shown. It is made of a material with resistivity p. A potential difference V is set up between the inner and outer surfaces of the shell, so that the current i flows radially out. In terms of given quantities: (a) what is the resistance R of the shell to this radial current flow? (b) what is the current density J through R? (c) ersity alhat is the electric field E between the surfaces? a E, J

E VirtualDv 4. A spherical shell has an inner radius a and outer radius b, as shown. It is made of a material with resistivity p. A potential difference V is set up between the inner and outer surfaces of the shell, so that the current i flows radially out. In terms of given quantities: (a) what is the resistance R of the shell to this radial current flow? (b) what is the current density J through R? (c) ersity alhat is the electric field E between the surfaces? a E, J