Two small charged spheres separated by a distance d exert a force F on each other.If they are immersed in a liquid of dielectric constant 4 then new force on any of the spheres will be (distance between the charge remains same)

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

Two charges of equal magnitudes and at a distance r exert a force F on each other. If the charges are halved and distance between them is doubled, then the new force acting on each charge is

The force of attraction between two charges separated by certain distance in air is F_(1) .If the space between the charges is completely filled with dielectric of constant 4 the force becomes F_(2) .If half of the distance between the charges is filled with same dielectric the force between the charges is F_(3) Then F_(1):F_(2):F_(3) is

Two point charges 4e and e each, at a separation r in air, exert force of magnitude F. They are immersed in a medium of dielectric constant 16. What should be the separation between the charges so that the force between them remains unchanged.

Two identical metals balls with charges +2Q and -Q are separated by some distance and exert a force F on each other . They are joined by a conducting wire , which is then removed. The force between them will now be

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