Two point charges of $5 \mathrm{\mu C}$ and $-2 \mathrm{\mu C}$ are kept at the opposite corners $A$ and $C$ of a square respectively. The potential difference between the other corners of the square will be

Define electric potential due to a point charge and arrive at the expression for the electric potential at a point due to a point charge in its vicinity.

Calculate potential on the axis of a ring due to charge $\mathrm{Q}$ Uniformly distributed along the ring of radius $\mathrm{R}$.