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An isolated metal sphere of radius R, carrying an electric charge, Q is situated in a medium of relative permittivity, εr. A test chare is placed at a point P, distance r from the surface of the sphere. Let εo represent the permittivity of free space.
The electric potential at P is given by the expression
A.
| Q 4πεoεrr |
B.
| Q 4πεoεr(R + r) |
C.
| Q 4πεoεr(R - r) |
D.
| Q 4πεoεrR |
Answer: D
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