Draw a graph for variation of potential $\mathrm{V}$ with distance $\mathrm{r}$ for a point charge $\mathrm{Q}$.
Draw a graph for variation of potential $\mathrm{V}$ with distance $\mathrm{r}$ for a point charge $\mathrm{Q}$.
Electrostatic potential of a point charge $\mathrm{V}=\frac{k \mathrm{Q}}{r}$ and electric field $\mathrm{E}=\frac{k \mathrm{Q}}{r^{2}}$ here, $k \mathrm{Q}$ is constant $\therefore \mathrm{V} \propto \frac{1}{r}$ and $\mathrm{E} \propto \frac{1}{r^{2}}$
Equation of electrostatic potential $\mathrm{V}=\frac{k Q}{r}$ shows that if $\mathrm{Q}$ is positive then at all points electrostatic potential is positive and if $Q$ is negative then at all points electrostatic potential is negative.
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