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F = 100 N
R = 6 cm = 6 x 10⁻² m
q1 = q2 = q
ditanyakan :
q = ?
jawab :
F = k q1 q2 x 1/r²
100 = 9 x 10⁹ x q² x 1/36x10⁻⁴
100 = 1/9 x 10¹³ x q²
9 x 10¹¹ = q²
q = 3 x √10¹¹ C