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Angular Momentum

The angular m...

Question

The angular momentum about the center of mass shortly before and after the collision

A

Increases

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B

Decreases

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C

Remains same

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D

None of these

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Solution

The correct option is C Remains same
$F_{e x t e r n a l} = 0 ⟹ τ_{e x t e r n a l} = 0$
$\frac{d L}{d t} = τ_{e x t e r n a l} = 0 ⟹ L = c o n s t a n t$
Thus angular momentum $L$ is conserved about the center of mass just before and after the collision.

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