A conducting sphere A of radius a, with charge Q, is placed concentrically inside a conducting shell B of radius b. B is earthed C is the common centre of the A and B.

Options

A. The field is at a distance r from C, where `altrltb " ""is"(1)/(4pi epsilon_(0))(Q)/(r^(2))`
B. The potential at a distance r from C, where a `altrltb " ""is"(1)/(4pi epsilon_(0))(Q)/(r)`
C. The potential difference betwee A and B is `(l)/(4pi epsilon_(0))Q((1)/(a)-(1)/(b))`
D. The potential at a distance r from C, where `altrltblt,(1)/(4piepsilon_(0))Q((1)/(a)-(1)/(b))`

Answer

A, C, D