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A constant force F is applied at the top of a ring of mass M and radius is R as shown. The angular momentum of particle about point of contact at time t

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Is constant

Increases linearly with time

Is 2FRt

Decreases linearly with time

answer is B, C.

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Detailed Solution

From angular impulse = change in angular momentum. We have $\frac{dL}{dt} = τ$

So, $L = F (2 R) t$ ,

i.e., L varies linearly with time.

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