The electric potential $V$ at a distance $r$ from a point charge $q$ is given by:

Solution

1. The electric potential $V$ at a point is defined as the work required per unit charge to bring a positive test charge from infinity to that point.
2. For a point charge $q$, the electric potential is inversely proportional to the distance $r$ from the charge.
3. The mathematical expression for this potential is $V=\frac{kq}{r}$, where $k$ is Coulomb's constant.
4. Hence the answer is (B).