The electric force between two point charges is given by Coulomb's law:
$F = k \frac{|q1 \cdot q2|}{r^2}$
where $F$ is the electric force, $k$ is the electrostatic constant ($k = 8.99 \times 10^9 Nm^2/C^2$), $q1$ and $q2$ are the charges, and $r$ is the distance
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