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A disc is rotated about its axis with a ...

A disc is rotated about its axis with a certain angular velocity and lowered gently on a rough inclined plane as shown in Fig., then

A

It will rotate at the position where it was placed and then will move downward

B

It will go downward just after it is lowered

C

It will go downward first and then climb up

D

It will climb upwards and then move downwards

Text Solution

Verified by Experts

The correct Answer is:
A
Here kinetic friction force will balance the force of gravity along the incline. So it will rotate at its initial position and will not move up or down. As its angular velocity becomes zero (friction also becomes zero), it will move downwards.
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