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F = 10⁻¹⁵ N
r = 12 cm = 0,12 m
ditanyakan :
q1 = q2 = q =?
jawab :
F = k q1 q2 1/R²
10⁻¹⁵ = 9x10⁹ x qxq x 1/0,12²
10⁻¹⁵ = 9x10⁹ x q² x 1/144x10⁻⁴
144x10⁻¹⁹ = 9x10⁹ x q²
q² = 16x10⁻²⁸
q = 4x10⁻¹⁴ C