Home Physics System of Particles Rotational Motion Angular Momentum A particle is confined to rotate in a circul…
Physics System of Particles Rotational Motion Angular Momentum MCQ (Single Correct)

A particle is confined to rotate in a circular path with decreasing linear speed. Then which of the following is correct?

A
(angular momentum) is conserved about the center
B
only direction of angular momentum is conserved
C
it spirals towards the center
D
its acceleration is towards the center.

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Text Solution

Verified by Experts
The correct answer is:
B

As the particle has decreasing linear speed , so also decreases i.e., is not conserved. Option is not correct.
Direction of ( ) remains same, hence the direction of remains the same. Option is correct.
As the particle is confined to rotate in a circular path, it cannot spiral towards the center. Option is incorrect.
As the particle has a decreasing speed, it must have a transverse acceleration in addition to the centripetal acceleration. So its acceleration makes some angle with the radius. Option is incorrect.

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