The electrostatic energy between two point charges is given by the formula:
$U = \dfrac{kQ_1Q_2}{r}$
where $U$ is the electrostatic energy, $k$ is the electrostatic constant ($8.99 \times 10^9 Nm^2/C^2$), $Q_1$ and $Q_2$ are the charges, and $r$ is the distance
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