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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Assertion (A): In case of rolling without sliding, friction force can act in forward and backward direction both.
Reason (R): The angular momentum of a system will be conserved only about that point about which external angular impulse is zero.

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Correct option: B

Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

Option B is correct because both the assertion and reason are true, but the reason does not explain the assertion. Friction can act in both directions, and angular momentum conservation depends on external angular impulse.

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