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q₁ = 3μC = 3x10⁻⁶ C
q₂ = 15μC = 15x10⁻⁶ C
r = 5cm = 5x10⁻²
F = k. q₁q₂
r²
= 9 x10⁹ . 3x10⁻⁶ 5x10⁻⁶
(5x10⁻²)²
= 9 x 3 x 5 x10⁻³
2.5 x 10⁻³
= 135 / 2.5
= 54 N