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Q₁ = -6×10⁻⁶ C
q₂ = -8×10⁻⁶ C
r = 0,4 m = 4×10⁻¹ m
k = 9×10⁹ Nm²C⁻²

F = k q₁ q₂ / r²
F = 9×10⁹ . 6×10⁻⁶ . 8×10⁻⁶ / ( 4×10⁻¹ )²
F = 432×10⁻³ / 16×10⁻²
F = 27×10⁻¹
F = 2,7 N