First slide

Torque

Question

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.

Moderate

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.

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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