Two metallic shells with charges `q `each are kept in air with their centre distance r .The magnitude of electrostatic force between them is `(K=(1)/(4 pi varepsilon_(0)))`

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.

Inside a neutral hollow conducting sphere of radius X and centre C, a point charge q is placed as shown in the figure. Another point charge q_1 , is placed outside the sphere at distance d from centre. The net- electrostatic force on charge q placed at the centre is K=1/(4piepsilon_0)

Two large conduction spheres carrying charges Q_(1) and Q_(2) are brought close to each other. Is the magnitude of the force between them exactly given by Q_(1)Q_(2)//4piepsilon_(0)r^(2) . Where r is the distance between their centers.

There are two point charges +4 mu C and -2 mu C .The ratio of magnitude of electrostatic forces acting on them respectively will be

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: