Two charge spheres separated at a distance d exert a force F on each other. If they are immersed in a liquid of dielectric constant K=2, then the force (if all conditions are same) is

Options

A. `F//2`
B. F
C. 2F
D. 4F

Answer

A

Explanation

`F prop 1/K` i.e. `F_("air")/F_("medium") =K`
`implies F_("liquid") = (F_("air"))/(K)=F/2` [As K = 2] .