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Questions  

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 :

a
2g3L
b
3g2L
c
g/L
d
2g/L

detailed solution

Correct option is B

τ=Iα⇒mgL2=ml23α⇒ α=3g2L

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