The net electric force on a charge of `+3 muC` at the mid-point on the line joining two charges of magnitude `+2 muC` and `-2 muC` separated by the distance of 6 mm, is

Determine the electrostaic energy of a system containing two charges 7muC and -2muC separated by a distance of 18 cm.

Calculate the work required to bring a unit positive charge from infinity to a mid-point between two charges 20muC" and " 10muC separated by a distance of 50 m.

Two tiny spheres carrying charges 1.5muC and 2.5muC are located 30 cm apart. Find the potential and electric field : (a) at the mid-point of the line joining the two charges and (b) at a point 10 cm from this midpoint in a plane normal to the line and passing through the mid-point.

Two point charges of +3 muC each are 100 cm apart. At what point on the line joining the charges will the electric intensity be zero ?

The distance between the two charges 25 muC and 36 muC is 11 cm. at what point on the line joining the two, the intensity will be zero?