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