Two small spherical balls of mass 10 g each with charges -2 μ C and 2 μ C, are attached to two ends of very light rigid rod of length 20 cm. The…

Two small spherical balls of mass $\displaystyle 10$ g each with charges $\displaystyle -2 \mu C$ and $\displaystyle 2 \mu C$, are attached to two ends of very light rigid rod of length $\displaystyle 20$ cm . The arrangement is now placed near an infinite nonconducting charge sheet with uniform charge density of $\displaystyle 100 \mu \mathrm{C} / \mathrm{m}^2$ such that length of rod makes an angle of $\displaystyle 30$° with electric field generated by charge sheet. Net torque acting on the rod is: (Take $\displaystyle \varepsilon_o: 8.85 \times 10^{-12} \mathrm{C}^2 / \mathrm{Nm}^2$ )