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r1 = 16 cm
F1 = 30 N
r2 = 8 cm
dit :
F2 = ?
jawab :
F1/F2 = (r2)²/(r1)²
30/F2 = 8²/16²
30/F2 = 64/256
30/F2 = 1/4
1 . F2 = 30 . 4
F2 = 120 N
jadi, gaya coulomb kedua muatan tersebut adalah 120 N
semoga membantu