Given:
q1 = -6.0 µC
q2 = 7 µC
Distance between q1 and q2, r12 = 3.0 m
Using Coulomb's Law:
\[ F_{12} = \frac{1}{4\pi \varepsilon_0} \frac{q_1 q_2}{r_{12}^2} \]
Substitute the values:
\[ F_{12} = \frac{9 \times 10^9 \times (-6 \times 10^{-6}) \times (7 \times
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