A charge of $8\; mC$ is located at the origin. Calculate the work done in taking a small charge of $−2 \times 10^{−9}\; C$ from a point $P (0, 0, 3 \;cm)$ to a point $Q (0, 4 \;cm, 0)$, via a point $R (0, 6cm, 9 cm)$.

Question

$\begin{array}{1 1} 96\;J \\ 1.27\;J \\ 45\;J \\ 0.27\;J\end{array}$