Question

A particle moves with a constant velocity parallel to the Y-axis. Its angular momentum about the origin ___________.

A
is zero
B
remains constant
C
goes on increasing
D
goes on decreasing

Solution

The correct option is B remains constantAngular momentum   $$L = mxv$$where  $$x$$ is the distance of the particle on x-axis from the origin and $$v$$ is the velocity. Since the particle is moving parallel to y-axis, so its distance on the x-axis from the origin remains the same and thus its angular momentum about the origin remains the same.Physics

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