The electric force between two charges can be calculated using Coulomb's law:
\[ F = \frac{{k \cdot |q_1 \cdot q_2|}}{{r^2}} \]
where F is the electric force, k is the electrostatic constant (9.0 x 10^9 N m^2/C^2), q1 and q2 are the charges, and r is the
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