The electric force between two point charges is found from Coulomb's law:

$\overline{){\mathbf{F}}{\mathbf{=}}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}}$

Coulomb's constant, k = 9.0 × 10^{9} kg⋅m^{3}⋅s^{−2}⋅C^{−2}.

Suppose you have two point charges each of 79 nC. How many millimeters apart must the two charges be to have a force of 1.15 N between them?

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