Two small spherical balls of mass \( 10\,\text{g} \) each with charges \( -2\,\mu\text{C} \) and \( 2\,\mu\text{C} \), are attached to two ends of very light rigid rod of length \( 20\,\text{cm} \). The arrangement is now placed near an infinite non-conducting charge sheet with uniform charge density of \( 100\,\mu\text{C}/\text{m}^{2} \) such that length of rod makes an angle of \( 30^\circ \) with electric field generated by charge sheet. Net torque acting on the rod is:
(Take \( \varepsilon_{0}:8.85\times10^{-12}\,\text{C}^{2}/\text{Nm}^{2} \) )
