Two charges $Q_{1}=2.4 \times 10^{-10} \mathrm{C}$ and $Q_{2}=9.2 \times 10^{-10}$ C are near each other, and charge $\mathbf{Q}_{12}$ exerts a force $\mathbf{F}_{1}$ on $\mathbf{Q}_{2}$ is increased by a factor of 4?