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q1 = 4 x10⁻⁶ C
q2 = 3 x 10⁻⁶ C
R = 4 cm = 4 x10⁻² m
ditanyakan :
F =?
jawab :
F = k q1 q2 1/R²
F = 9x10⁹ x 4x10⁻⁶ x 3x10⁻⁶ x 1/(4x10⁻²)²
F = 108 x 10⁻³ / 16x10⁻⁴
F = 67,5 N