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Q2 = 64 x 10⁻⁴ C
F = 27000 N
R = ?
F = k x Q1 x Q2 x 1/R²
R ² = k x Q1 x Q2 x 1/F
R² = 9x10⁹ x 3 x10⁻⁶ x 64x10⁻⁴ x 1/27000
R² = 64x10⁻⁴
R =√ 64x10⁻⁴
R = 8 x 10⁻² m = 8 cm