Question

Initially tube is in rest and a spherical ball floats inside the liquid and just touches the upper surface of the tube and spherical ball is tied with a string as shown in the figure. The tube starts rotating with a constant angular velocity ${}^{\prime }{\omega }^{\prime }$. Then

• A. Ball moves away from axis of rotation
• B. String becomes loose.
• C. The tension in the string increases
• D. If string is cut ball moves towards axis of rotation
• E. Answer Required

Answer 1

The correct option is B String becomes loose.

When the tube starts rotating so centrifugal forces acts away from the axis, making it to moves away from axis of rotation resulting in decrease in tension on string.