2 benda terpisah jarak R timbul gaya listrik 27 N bila jaraknya di perbesar menjadi 3R, berapa gaya listrik sekarang?
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• Gaya listrik
r1 = R → F1 = 27 N
r2 = 3R → F2 = ___?
F = k Q1 Q2 / r²
F berbanding terbalik dengan kuadrat jarak
F2 / F1 = r1² / r2²
F2 = F1 (r1 / r2)²
F2 = 27 • (R / 3R)²
F2 = 3 N ← jwb