Q. Two masses m and $\frac{m}{2}$ 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 0. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:

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