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Question: A tube AC forms a quarter circle in a vertical plane. The ball B has on area of cross – section slig...

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

A

Always in contact with the inner wall

B

Always in contact with the outer wall

C

Initially in contact with the inner wall and at some point it comes in contact with the outer wall.

D

Initially in contact with the outer wall and finally comes in contact with the inner wall.

Answer

Initially in contact with the inner wall and at some point it comes in contact with the outer wall.

Explanation

Solution

At the break – off point cos θ = 2/3, it comes in contact with outer wall.