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- gaya listrik
r = 2 m → F = 9 N
r' = 3 m → F' = __ ?
Hk Coulomb
F = k Q₁ Q₂ / r²
gaya F berbanding terbalik dengan kuadrat jaraknya
F' / F = r² / r'²
F' = (r / r')² · F
F' = (2 / 3)² · (9 N)
F' = ⁴/₉ · (9 N)
F' = 4 N ← jwb