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Verified answer
Diketahui :r = 6 cm = 6×10^-2 m
q1 = -7 uC = -7×10^-6 C
q2 = 4 uC = 4×10^-6 C
k = 9×10^9 Nm²/C²
Ditanya :
F = ?
F = k×q1×q2/r² = 9×10^9 × 7×10^-6 × 4×10^-6 / (6×10^-2)² = 9×7×4×10^-3 / 36×10^-4 = 7×10¹ N = 70 N