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q1 = 30 μC = 30 .10^-6 C
q2 = 15 μC = 15.10^-6 C
r = 15 cm = 15.10^-2 m
k = 9.10^9 Nm²/C²
Dit: F....?
F = k . q1 . q2 / r²
F = 9.10^9 . 30.10^-6 . 15.10^-6 / (15.10^-2)²
F = 9.10^9 . 30.10^-6 . 15.10^-6 / 225.10^-4
F = 4050.10^-3 / 225.10^-4
F = 180 N