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

Answer 1

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.