A hollow metal sphere of radius `5 cm` is charged so that the potential on its surface is `10 V`. The potential at the centre of the sphere is

Options

A. 0 V
B. 10 V
C. Same as at point 5 cm away from the surface
D. Same as at point 25 cm away from the surface

Answer

A

Explanation

For a metal a conductor –
`E_("inside") =0`
Since, `E=(-dV)/(dr) implies (dV)/(dr) = 0`
`implies V =` constant inside the conductor.