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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.

a
If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
b
If both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.
c
If Assertion is correct but Reason is incorrect.
d
If Assertion is incorrect but Reason is correct.

detailed solution

Correct option is C

L about centre = mvR = constantA s,  τ=dLdt and derivative of any constant is zero.∴  τcentre =0

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