Physics

Anyone out there to answer?

Two point charges placed at a distance "r" in air exert a force "F" on eachother. The value of distance R at which the experience the same force when placed in a medium of dielectric constant k is:

1) rk

2) r/k

3) r/vk

4)rvk

Guys there is an error in the forums that the radical sign is appearing as "v".

So in the options above "v" represent the radical/sq.root/ under root sign.

option D??

Yeah, but how?

No buddy the answer is c