A system consisting of two charges $7 \mu C$ and $–2 \mu C$ placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively

Question

$\begin{array}{1 1} 48.3\;J \\49.3\;J \\ 46.5\;J \\ 59.2\;J \end{array} $