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Question

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


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

The correct option is B remains constant
Angular 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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