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R1 = 3
R2 = 3R
F2 = ?
F2/F1 = (R1/R2)²
F2/F = (R/3R)²
F2 = 1/9 F
jadi besar gayanya menjadi 1/9 kali
F = kq²/r²
r'=3r
F'=kq²/r'²
= kq²/9r²
= 1/9 F