The formula is given by Coulomb's Law:
\[ F = k \frac{|q_1 q_2|}{r^2} \]
where \( F \) is the force between the charges, \( k \) is Coulomb's constant (\( 8.99 \times 10^9 \, \text{N m}^2/\text{C}^2 \)), \( q_1 \) and \( q_2 \) are the magnitudes of the charges,
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