JEE Main Physics question

Physics Laws of Motion JEE Main

A particle moves in a circular path with decreasing speed. Which of the following statements is correct? **[IIT JEE 2005]**

(A)The angular momentum remains constant in magnitude
(B)The direction of the angular momentum remains constantCorrect
(C)The particle moves in a spiral path with decreasing radius
(D)The acceleration of the particle is directed away from the centre

Answer: (B)

Solution

Since the path stays circular (radius unchanged, only speed decreases, ruling out a spiral), the angular momentum vector stays perpendicular to the plane of motion throughout, so its direction never changes

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Question ID VK-157591