State the principle of superposition of potentials. Find an expression for the potential at a point due to an electric dipole on its axis, if P is electric dipole moment.

Explanation

Principle of superposition of potentials state that potential at a point due to a group of charges is equal to scalar sum of potentials due to all individual charges constituting a group. The potential due to each charge is calculated as if other charges were not present.
Electric potential at an axial point of a dipole