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q₂ = -30 coul
r = 1 cm = 10⁻² m
k = 9×10⁹ Nm²/coul²
F = kq₁q₂ / r²
F = (9×10⁹ Nm²/coul²)(2×30 coul²) / (10⁻² m)²
F = ( 9×10⁹×2×30 ÷ 10⁻⁴ ) N
F = 540×10⁹⁻⁽⁻⁴⁾ N
F = 540×10¹³ N