We know that the force between two point charges is given by Coulomb's law:
$$F = k \frac{q_1 q_2}{r^2}$$
where $F$ is the force, $k$ is the electrostatic constant ($k \approx 8.99 \times 10^9 N m^2 C^{-2}$), $q_1$ and $q_2$ are the magnitudes of the charges,
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