Two concentric spheres of radii `R` and `2R` are charged. The inner sphere
Channel: Doubtnut
Date: 2020-07-26

Two concentric spheres of radii `R` and `2R` are charged. The inner sphere has a charge  if `1muC` and the outer sphere has a charge of `2muC` of the same sigh. The potential is `9000 V` at a distance `3R` from the common centre. The value of R is