Net force per unit length on C is $\sqrt{84}\times {10}^{-5}{\mathrm{Nm}}^{-1}$, making an angle tan^–1 $\left(\frac{2}{\sqrt{3}}\right)$ to the X-axis.

Net force per unit length on C is $\sqrt{84}\times {10}^{-5}{\mathrm{Nm}}^{-1}$, making an angle $\frac{\mathrm{\pi }}{2}+{\tan }^{-1}\left(\frac{2}{\sqrt{3}}\right)$ to the X-axis.

Repulsive force per unit length on C is less than the attractive force on C.

Repulsive force per unit length on C is greater than the attractive force on C.