Determine the potential at a point 0.50 m (i) from `a+20 muC` potential charge (ii) from `a-20 muC` point charge.

Potential at a point 0.1m from an isolated point charge is +100 volt. The nature of the point charge is

The electric potential at 0.9m from a point charge is +50 V . What is the magnitude and sign of the charge ?

(a). Determine the potential energy of a system containing two charges 7muC and -2muC separated by a distance 18 cm. (b) How much work is needed to separate the two charges infinitely away from each other?

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

Find out electric field intensity at point A (0, 1m, 2m) due to a point charge -20 muC situated at point B (sqrt(2)m, 0, 1m) .