Three concentric spherical conducting shells A, B and C of radii a, 2a and 4a are initially given
Channel: Doubtnut
Date: 2020-01-26

Three concentric spherical conducting shells A, B and C of radii a, 2a and 4a are initially given charges +Q, -2Q and +Q respectively. The charge on the middle spherical shell B after switches `S_(1)` and `S_(2)` are simultaneously closed, will be