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Angular Momentum

A boy sitting...

Question

A boy sitting firmly over a rotating stool has his arms folded. If he stretches 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

Can't say

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Solution

The correct option is C remains unchanged
As we can see, there is no external torque present. Hence, angular momentum $L$ will be conserved.

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Angular Momentum

Standard XIII Physics

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