Q81 / 180 · AIIMS 2014 · Physics

A particle moves in a circular path with decreasing speed. Choose the correct statement.

A
Angular momentum remains constant
B
Acceleration $\vec{a}$ is towards the centre
C
Particle moves in a spiral path with decreasing radius
Correct answer
D
The direction of angular momentum remains constant

Solution

Angular momentum is an axial vector, so its direction is along the axis, perpendicular to the plane of motion which is not changing because of change of speed. Therefore, the direction of angular momentum remains the same and its magnitude may vary.

Hence, the correct answer is option: 'D'.

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