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Verified answer
Q1 = 6CQ2 = 12C
r = 30 cm = 30×10-² m
k = 9×10⁹ Nm²/C²
F = k Q1 Q2 / r²
F = 9×10⁹ . 6 . 12 / (30×10-²)²
F = 648×10⁹ / 900×10-⁴
F = 648×10⁹ / 9×10-²
F = 72×10¹¹ N