Draw a graph for the variation of electrostatic potential $V$ with distance $r$ from a point charge $Q$.

(N/A) The electrostatic potential $V$ due to a point charge $Q$ at a distance $r$ is given by the formula $V = \frac{kQ}{r}$,where $k = \frac{1}{4\pi\epsilon_0}$ is Coulomb's constant.
From this relation,we can see that $V \propto \frac{1}{r}$.
As the distance $r$ increases,the potential $V$ decreases hyperbolically.
If the charge $Q$ is positive,the potential $V$ is positive for all $r > 0$. If the charge $Q$ is negative,the potential $V$ is negative for all $r > 0$.
The graph of $V$ versus $r$ is a hyperbola that approaches the $r$-axis as $r \to \infty$ and approaches infinity as $r \to 0$.