Q. A particle moves in a circular path with decreasing speed. Choose the correct statement
A) Angular momentum remains constant
B) Acceleration $\overrightarrow{\mathbf{a}}$ is towards the centre
C) Particle moves in a spiral path with decreasing radius
D) The direction of angular momentum remains constant
Explanation
(d) 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
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.