Question

A uniform rod is rotating about a horizontal axis as shown. The rod is hinged at one of the ends. The rod is released from a vertical position by slightly pushing it. As the rod moves from $A$ to $B$

• A. both the direction and magnitude of angular momentum about the axis change
• B. the direction of $\overset{ \rightarrow }{L}$ changes but magnitude does not
• C. the direction of $\overset{ \rightarrow }{L}$ does not change but magnitude does
• D. neither the direction nor the magnitude changes

Answer 1

Answer: (C)

As the angular velocity increases without any change in its direction, we can say that the magnitude of angular momentum increases without any change in direction.