Two point charges placed at a distance in air exert a force on each other

PHYSICS · Single correct · CBSE · Physics · Electric Charges and Fields · Electric Charges and Fields

Problem

Two point charges placed at a distance

r

in air exert a force

F

on each other. The value of distance

R

at which they experience force

4F

when placed in a medium of dielectric constant

K = 16

is: (a)

r

(b)

r/4

(c)

r/8

(d)

2r