In a liquid medium of dielectric constant `k_(1)`,two small point charges `(q,m)` are suspended from a point in liquid by threads of equal length.The angle between them is `60^(@)` .In another medium of dielectric constant `k_(2)` ,the angle between them becomes `120^(@)` Then ratio `k_(1)/k_(2)` is

In a liquid medium of dielectric constant K and of spherical gravity 2 two identically charged spheres are suspended from a fixed point by threads of equal length .The angle between them is 90^(@) .In another medium of unknown dielectric constant K^(1) and specific gravity 4 the angle between them become 120^(@) if density of material of spheres is 8gm//c c then K^(1) is

If the gap between the plates of a parallel plate capacitor is filled with medium of dielectric constant k=2 , then the field between them

Two charges q_1 and q_2 are placed in vacuum at a distance d and the force acting between them is F . If a medium of dielectric constant 4 is introduced around them, the force now will be

Two charges are at distance (d) apart in air Coulomb force between them is F. If a dielectric material of dielectric constant (K) is placed between them, the coulomb force now becomes.

Two point charges placed at a distance r in air experience a certain force. Then the distance at which they will experience the same force in a medium of dielectric constant K is

The energy density of a medium of dielectric constant k surrounding the charged conductor is