A rod PQ of mass M and length L is hinged at end P . The rod is kept horizontal by a massless string tied to point $Q$ as shown in figure. When string is cut, the initial angular acceleration of the rod is :-

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τ = I α ⇒ M g 2 L ​ = 3 1 ​ M L 2 ∝⇒ α = 2 L 3 g ​

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