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Question 30360
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Rigid Body Dynamics: JEE — Angular Momentum Direction MCQ

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JEE — Angular Momentum DirectionMediumQuestion 30360

Question

The angular momentum L = r × p. If a particle moves in the xy plane, L is directed:
  1. A
    In the xy plane
  2. B
    Along x or y axis only
  3. C
    Along the z axis
    Correct
  4. D
    Radially outward

Correct answer

Along the z axis

Explanation

r and p both lie in the xy plane. Their cross product r × p is perpendicular to that plane, i.e., along the z axis.

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