Assertion (A) : When a uniform metallic rod rotating about perpendicular bisector with constant angular…
Assertion (A) : When a uniform metallic rod rotating about perpendicular bisector with constant angular speed is heated uniformly to raise its temperature slightly, its speed of rotation increases.
Reason (R) : When a metal rod is heated uniformly to raise its temperature slightly its moment of inertia increases.
(A) and (R) are true and R is correct explanation of A.
(A) and (R) are true but (R) is not correct explanation of $\mathrm{A}$
(A) is true, but (R) is false
(A) is false but $\mathrm{R}$ is true
Solution
When rod is heated uniformly, its moment inertia increases As L = constant, so angular speed should decrease.