If a particle moves in the x-y plane, the resultant angular momentum has

Only x-component

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Only y-component

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Both x and y-components

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Only z-components

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Solution

The correct option is D Only z-components
Angular momentum is given as $L = r \times P$ (P is the linear momentum).
Position vector and r and momentum vector both lie in the same plane say xy plane.
Thus, using the right hand rule for cross product, the angular momentum points in z direction.

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Q. A particle is moving in x-y plane. Which component of linear momentum does not contribute to angular momentum?

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