A small conducting spherical shell with inner radius a and outer radius b is concentric with a larger conducting spherical shell with inner radius c and outer radius d. The inner shell has total charge +2q, and the outer shell has charge +4q. (K=(1)/(4piepsilon_(0)))

Find the electric field in terms of q and the distance r from the common centre of the two shells for (i) `r lt a` (ii) `a lt r lt b`

Options

A. 0,0
B. `+q, - q`
C. 2q, -2q
D. `-q, q//2`

Answer

A