Angular momentum of a single particle moving with constant speed along circular path: (a) changes in magnitude but remains same in the direction (b) remains same in magnitude and direction (c) remains same in magnitude but changes in the direction (d) is zero

Answer: (b). About the centre, L = mvr with v and r constant, so the magnitude is constant. L is always perpendicular to the fixed plane of the circle, so its direction is constant. So the answer is (b).

Angular momentum of a single particle moving with constant speed… | JEE Main 2021 (31 Aug, Shift 1)

Q45JEE Main 2021 · 31 AUG · SHIFT 1Easy

Angular Momentum & its Conservation

Angular momentum of a single particle moving with constant speed along circular path:

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Answer: (b)

About the centre, $L = mvr$ with $v$ and $r$ constant, so the magnitude is constant.
$\vec L$ is always perpendicular to the fixed plane of the circle, so its direction is constant.
So the answer is (b).

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