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A uniform metallic rod rotates about it...

A uniform metallic rod rotates about its perpendicular bisector with constant angualr speed. If it is heated uniformly to raise its temperature slightly, then

A

its speed of rotation increases.

B

its speed of rotation decreases.

C

its speed of rotation remains same.

D

its speed increases because its moment of inertia increases.

Text Solution

Verified by Experts

The correct Answer is:
B
On heating, the rod will expand and as a result its moment of inertia about a perpendicular bisector increases and hence, its angular speed decreases (from law of conservation of angular momentum).
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