The force between two charges situated in air is $F$. The force between the same charges if the dist

Question

The force between two charges situated in air is $F$. The force between the same charges if the distance between them is reduced to half and they are situated in a medium having dielectric constant 4 is

Professor PC Thomas Classes · Answer

Force $F' = \frac{1}{K} \frac{q_1 q_2}{(r/2)^2} = \frac{4}{4} F = F$.