解答
$F = k_e \frac{|q_1 q_2|}{r^2}$, where $k_e = \frac{1}{4\pi\varepsilon_0} \approx 8.99 \times 10^9 \text{ N}\cdot\text{m}^2/\text{C}^2$.
解説
The force acts along the line joining the charges; like charges repel, whereas opposite charges attract.
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What is Coulomb's Law for the electrostatic force between two point charges $q_1$ and $q_2$ separated by distance $r$?
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