Coulomb's Law states that the electrostatic force between two charges is given by:
$F = k \frac{q_1 q_2}{r^2}$
where $F$ is the electrostatic force, $k$ is Coulomb's constant ($8.99 \times 10^9 \, \mathrm{N \cdot m^2/C^2}$), $q_1$ and $q_2$ are the charges, and
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