Deduce an expression for the electric potential due to an electric dipole at any point on its axis. Mention one contrasting feature of electric potential at a point due to dipole as compared to that due to a single charge.

Explanation

For expression for electric potential, see Short Answer Question Number 5 just above.
Electric potential at any point distant r from the centre of a dipole varies as `V prop 1/r^2`, whereas potential due to a point charge varies as `V prop 1/r`.