Two masses m and m/2 are connected at the two ends of a massless rigid rod of length l. The rod is suspended by a thin wire of torsional constant k at the centre of mass of the rod-mass system(see figure). Because of torsional constant k, the restoring torque is \tau = k\theta for angular displacement θ. If the rod is rotated by \theta_0 and released, the tension in it when it passes through it mean position will be: [9-Jan-2019 Shift 1]