Two point charges placed at a certain distance `r` in air exert a force `F` on each other. Then, the distance `r'` at which these charges will exert the same force in a medium of dielectric constant `K` is given

Question

Two point charges placed at a certain distance `r` in air exert a force `F` on each other. Then, the distance `r'` at which these charges will exert the same force in a medium of dielectric constant `K` is given by

Options:
(a) `r` (b) `r'/'K` (c) `r'/'sqrtK` (d) `rsqrtK`