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F = kq² / r²
kq² = Fr²
q² = Fr² / k
q = r√(F / k)
q = (6 x 10⁻² m)√(1,2 x 10¹ N / 9 x 10⁹ Nm²/C²)
= (6 x 10⁻² m)√(2/15 x 10⁻⁸ C²/m²)
= (6 x 10⁻² m)(1/15√30 x 10⁻⁴ C/m)
= 2/5 √30 x 10⁻⁶ C
= 2/5 √30 μC