Question

3. Electrostatic potential due to point charge at any point?

Answer 1

Electric Potential. We now move towards the electric potential which is potential energy per unit charge. Thus electrostatic potential at any point of an electric field is defined as potential energy per unit charge at that point.
Point Charge Potential. The electric potential(voltage) at any point in space produced by apoint charge Q is given by the expression below. It is the electric potential energy per unit charge and as such is a characteristic of the electric influence at that point in space.