We know that the electric force between two charges can be calculated using Coulomb's Law: $F = k \frac{q_1 q_2}{r^2}$, where $F$ is the force, $k$ is the electrostatic constant ($8.99 \times 10^9 \mathrm{N m^2 C^{-2}}$), $q_1$ and $q_2$ are the charges, and $r$
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