A bob of massm attached to an inextensible string of length l is suspended from a vertical support. The bob length l is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed `omega` rad/s about the vertical. About the point of suspension :

Options

A. angular momentum changes in direction but not in magnitude
B. angular momentum changes both in direction and magnitude
C. angular momentum is conserved
D. angular momentum changes in magnitude but not in direction

Answer

C

Explanation

`vecL` changes in direction not in magnitude because all other parameter for all the positions are the same. The direction changes as `vecL` is an axial vector.