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q₂ = -4μC = 4 x 10⁻⁶ C
r = 2 m
k = 9 x 10⁹ N/m²/C²
Fc = ...........?
Penyelesaian :
k . q₁. q₂
Fc = _________
r²
9 x 10⁹ . 8 x 10⁻⁶ . 4 x 10⁻⁶
Fc = ________________________
2²
288 x 10⁻³
Fc = __________
4
Fc = 72 x 10⁻³ N
Fc = 0,072 N
Jadi, besar gaya coulombnya adalah 0,072 N