A small conducting sphere of radius `r` is lying concentrically inside a bigger hollow conducting sphere of radius `R`. The bigger and smaller spheres are charged with `Q` and `q(Q gt q)` and are insulated from each other. The potential difference between the spheres will be

Options

A. `(1)/(4piepsilon_(0))[(q)/(r)-(q)/(R)]`
B. `(1)/(4piepsilon_(0))[(q)/(r)+(q)/(R)]`
C. `(1)/(4pi epsilon_(0))[(q)/(r)-(Q)/(R)]`
D. `(1)/(4pi epsilon_(0))[(q)/(r)+(Q)/(R)]`

Answer

A