The force exerted by a point charge is given by Coulomb's law: $F = k \frac{|q_1q_2|}{r^2}$, where $k = \frac{1}{4\pi\epsilon_0}$ is Coulomb's constant, $q_1$ and $q_2$ are the charges, and $r$ is the distance between the charges. The direction of the force is
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