A metal ball of radius `R` is placed concentrically inside hollow metal sphere of inner radius
Channel: Doubtnut
Date: 2020-08-23

A metal ball of radius `R` is placed concentrically inside hollow metal sphere of inner radius `2R` and outer radius `3R`.The ball is given a charge `+2Q` and the hollow sphere a total charge `-Q` .The electrostatic potential energy of this system is