When air is replaced by a dielectric medium of force constant

When air is replaced by a dielectric medium of force constant K, the maximum force of attraction between two charges, separated by a distance

1. decreases K-times
2. increases K-times
3. remains unchanged
4. becomes 1 times
  K²

In air, F_air =	1	.	q₁q₂
	4πε₀		r²

In medium, F_m =	1	.	q₁q₂
	4πε₀		Kr²

∴	F_m	=	1	⇒ F_m =	F_air	(decreases K-times)
	F_air		K		K

becomes	1	times
	K²