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F2 = k . q1 q2 / r2²
F1/F2 = r2² / r1²
9/F2 = 3² / 2²
9/F2 = 9/4
9 . 4 = 9 F2
36 = 9 F2
F2 = 36/9 = 4 N
maka besar gaya tolak kedua muatan itu jika terpisah sejauh 3 meter adalah 4 N