Two metallic shells with charges `q `each are kept in air with their centre distance r .The magnitude of electrostatic force between them is

Two conducting spheres of radii R each are given equal charges +Q and are kept such that their centre are at distance r (geR) . The force of attraction (F) between them is:

A charged metallic sphere A having charge q_A is brought in contact with an uncharged metallic sphere of same radius and then separated by a distance d . What is the electrostatic force between them

Two point charged bodies q_(1) = 3 muC , and q_(2) = 4 muC are separated by 2 m in air. Find the magnitude of electrostatic force between them.

Total charge Q is divided between two point objects in such a manner that electric force of repulsion between them is maximum when placed at a separation d from each other. What is the magnitude of this maximum possible electrostatic force between them?

Two point charges placed in a medium of dielectric constant 5 are at a distance r between them, experience an electrostatic force ‘F’. The electrostatic force between them in vacuum at the same distance r will be-

Two charges 8 C and -6 C are placed with a distance of separation 'd' between them and exert a force of magnitude F on each other. If a charge 8 C is added to each of these and they are brought nearer by a distance (d)/(3) , the magnitude of force between them will be -