An electric charge ${10}^{-6 }\mathrm{\mu C}$ is placed at origin (0,0) m of $\mathrm{X}-\mathrm{Y}$ co-ordinate system. Two points P and Q are situated at $(\sqrt{3},\sqrt{3}) \mathrm{m}$ and $(\sqrt{6},0) \mathrm{m}$ respectively. The potential difference between the points P and Q will be :