The tube AC forms a quarter circle in a vertical plane. The ball B has an area of cross-section slightly smaller than that of the tube and can move without friction through it. B is placed at A and displaced slightly. It will

Question

The tube AC forms a quarter circle in a vertical plane. The ball B has an area of cross-section slightly smaller than that of the tube and can move without friction through it. B is placed at A and displaced slightly. It will, always be in contact with the inner wall of the tube, always be in contact with the outer wall of the tube, initially be in contact with the inner wall and later with the outer wall, initially be in contact with the outer wall and later with the inner wall

MARKS App · Accepted Answer

Initially speed of ball B is less hence centrifugal in non inertial frame is less, so ball is in contact with the inner surface when speed will be sufficient, ball will lose contact with the inner surface and goes in contact with the outer surface.

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