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r = 20 cm = 0,2 m
Q =?
E = kQ/R²
4,5x10⁻⁴ = 9x10⁹ Q/0,2²
4,5x10⁻⁴ x 4x10⁻² = 9x10⁹ Q
18 x 10⁻⁶ = 9x10⁹ Q
Q = 2x10⁻¹⁵ C