The force between two point charges is given by Coulomb's law:
$F = k \frac{|q_1 q_2|}{r^2}$
where $k = 8.98755 \times 10^9 N m^2/C^2$ is Coulomb's constant, $q_1$ and $q_2$ are the charges, and $r$ is the distance between them.
In this case, $q_1 = q_2 = 5 \times
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