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 the torsional constant $k$,the restoring torque is $\tau = k\theta$ for an angular displacement $\theta$. If the rod is rotated by $\theta_0$ and released,the tension in it when it passes through its mean position will be

  • A
    $\frac{3k\theta_0^2}{l}$
  • B
    $\frac{2k\theta_0^2}{l}$
  • C
    $\frac{k\theta_0^2}{l}$
  • D
    $\frac{k\theta_0^2}{2l}$

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