The electrostatic field due to a point charge depends on the distance r as `1/r^2`. Indicate which of the following quantities shows same dependence on r.

Options

A. Intensity of light from a point source
B. Electrostatic potential due to a point charge.
C. Electrostatic potential at a distance r from the centre of a charged metallic spher. Given rlt radius of the sphere.
D. None of these

Answer

A

Explanation

(a) `I prop 1/(r^2), V prop 1/r , V prop r^0` .