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Verified answer
K = 9×10⁹Q₁ = 2mc = 2×10-³ C
Q₂ = 5mc = 5×10⁻³ C
r = 10 cm = 10×10-² m
F = k Q1 Q2 / r²
F = 9×10⁹ . 2×10-³ . 5×10-³ / (10×10-²)²
F = 90×10³ / 100×10-⁴
F = 9×10⁴ / 10-²
F = 9×10⁶ N