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q2 = 6mC = 6x10⁻⁶ C
R = 3 cm = 3x10⁻² m
F= ?
F = k q1 q2 1/R²
F = 9x10⁹ x 3x10⁻⁶ x 6x10⁻⁶ x 1/(3x10⁻²)²
F = 9x10⁹ x 3x10⁻⁶ x 6x10⁻⁶ x 1/(9x10⁻⁴)
F = 180 N