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Q)

Determine the electrostatic potential energy of a system consisting of two charges $7 \mu C$ and $–2\;\mu C$ (and with no external field) placed at $(–9 cm, 0, 0)$ and $(9 cm, 0, 0)$ respectively.

$\begin{array}{1 1} 0.8\;J \\0.7\;J \\ 0.4\;J \\ 0.9\;J\end{array} $

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A)
Solution :
$U= \large\frac{1}{4 \pi \in_0} \frac{q_1q_2}{r} $
$\quad= 9 \times 10^9 \times \large\frac{7 \times (-2) \times 10^{-12}}{0.18}$
$\qquad= -0.7\;J$
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