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 point charges Q and - Q //4 are separated by a distance X . Then . force between this two charge

Two charges spheres are separated at a distance d exert a force F on each other, if charges are doubled and distance between them is doubled then the force is

Two tiny charged spheres separated in air by a distance exert a force 'F'on each other .If they are immersed in a liquid of dielectric constant 2,then the force is

Two identical conducting balls having positive charges q_1 and q_2 are separated by a center to center distance r. If they are made to touch each other and then separated to the same distance, the force between them will be.