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Moment of Inertia of a Rod

A person sitt...

Question

A person sitting firmly over a rotating stool has his arms stretched. If he folds his arms, his angular momentum about the axis of rotation

A

increases

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B

decreases

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C

remains unchanged

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D

doubles

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Solution

The correct option is C remains unchanged
According to the question, there is no external torgue and we know that in the absence of external torque, the angular momentum is conserved.
Hence, the angular momentum about the axis of the rotation remains unchanged.
The correct option is C.

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