Show that the work done by an external force in bringing a unit positive charge from infinity to a point is equal to electrostatic potential (V) at that point.

To move unit positive charge from one point to another on an equipotential surface

Work done in moving a unit positive charge through a disance x metre on an equipotential surface is

ABCD is a square of side 20 cm positive charges of +2 * 10^-9 C. +4 * 10^-9 C and + 8 * 10^-9 C are placed at the corners A, B and C respectively. Calculate the work required to be done to transfer a unit positive charge from D to the point of intersection of the diagonals.

A positive charge Q is located at a point. What is the work done if a unit positive charge is carried once, completely round the charge along a circle of radius r about this point ?

The work done in moving a charge 2xx10^(-9) C from a point of potential -2kV to another point P is 5xx10^(-5)J . Find the potential at point P.

Prove that the length of tangents drawn from an external point to a circle are equal.