JEE Main 2014 Physics question

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

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

Answer: (B)

Solution

about the suspension point. , and the angle between them (90°) stay

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Question ID VK-008732