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Question

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:


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

The correct option is B angular momentum changes in direction but not in magnitude
$$\bar{L}$$ changes in direction not in magnitude
magnitude of L = $$m\omega/l$$ upwards , which remains the same

110162_117839_ans_27a8df075c0d491fa50da8fd5e456de3.png

Physics

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