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

Solution

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

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