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Directions :These questions consists of two statements each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A body is moving along a circle with a constant speed. Its angular momentum about the
centre of the circle remains constant.
Reason : In this situation, a constant non-zero torque acts on the body.

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If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

If Assertion is correct but Reason is incorrect.

If Assertion is incorrect but Reason is correct.

answer is C.

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Detailed Solution

L about centre = mvR = constant

A s, $τ = \frac{d L}{d t}$ and derivative of any constant is zero.

$∴ τ_{centre} = 0$

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