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Q1 = -4x10⁻⁹ C
Q2 = +2x10⁻⁹ C
r = 2 cm = 2x10⁻²m
ditanyakn : F ?
Dijawab :
F = k Q1 Q2/r²
= 9x10⁹ x 4x10⁻⁹ x 2x10⁻⁹ / (2x10⁻²)²
= 72x10⁻⁹/4x10⁻⁴
= 18x10⁻⁵ N