There are three concentric thin spherical shells A, B and C of radii R, 2R, and 3R. Shells A and C are given charges q and 2q and shell B is earthed. Then which of the given is correct?

Options

A. charge on inner surface of shell C is `4/3 q`
B. charge on outer surface of shell B is `-4/3 q`
C. charge on outer surface of shell C is `2/3 q`
D. all the above

Answer

D