A conducting sphere of radius `R_(2)` has a spherical cavity of radius `R_(1)` which is non concentric with the sphere. A point charge `q_(1)` is placed at a distance r from the centre of the cavity. For this arrangement, answer the following questions.
Electric potential at the centre of the cavity will be :

Options

A. zero
B. `(Kq_(1))/(r_(2))`
C. `(Kq_(1))/(r^(2))-(Kq_(1))/(R_(1)^(2))`
D. None of these

Answer

D

Explanation

`because` Electric field (Magnitude only) at inner centre of cavity will be impossible to calculate from given data
`because` Charge distribution at the inner surface of cavity will be non uniform.