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)/(4pi epsilon_(0))((q)/(r )-(q)/(R ))`
B. `(1)/(4pi epsilon_(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