Q: A body moves with constant velocity v in a straight line parallel to x-axis. The angular momentum with respect to origin is

(a) Zero

(b) Constant

(c) Continuously increase

(d) Continuously decrease

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Ans: (b)

Sol: The magnitude of the angular momentum of a particle about a fixed point is equal to the product of its linear momentum and the length of the perpendicular to the linear momentum from the fixed point O.

Hence , The angular momentum with respect to origin is Constant .