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

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Angular momentum is conserved.

Angular momentum changes both in direction and magnitude

Angular momentum changes in direction but not in magnitude

Angular momentum changes in magnitude but not in direction

answer is C.

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Detailed Solution

Magnitude of $L = mlvsin 90^{0} = m \sqrt{r^{2} + h^{2}} v$ remains the same.

As the position of particle on circle changes, direction of $\vec{L}$ keeps on changing.

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