A solid conducting sphere of radius `a` has a net positive charge `2Q`. A conducting spherical shell of inner radius `b` and outer radius `c` is concentric with the solid sphere and has a net charge `-Q`. The surface charge density on the inner and outer surfaces of the spherical shell will be

Options

A. ` - (2Q)/(4 pi b^2) , Q/(4 pi c^2)`
B. `- Q/(4 pi b^2), Q/(4 pi c^2)`
C. `0,Q/(4pi c^2)`
D. None of the above

Answer

A