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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 $\omega\; rad/s$ about the vertical. About the point of suspension

$\begin{array}{1 1}(A)\;\text{angular momentum changes in direction but not in magnitude} \\ (B)\;\text{angular momentum changes both in direction and magnitude} \\(C)\;\text{angular momentum is conserved} \\(D)\;\text{angular momentum changes in magnitude but not in direction} \end{array} $

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The point of suspension is angular momentum changes in direction but not in magnitude
Hence A is the correct answer.
answered Apr 7, 2014 by meena.p

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