Question

A mass is performing vertical circular motion (see figure). The average velocity of the particle is increased, then at which point the string will break :

• A. A
• B. B
• C. C
• D. D

Answer 1

Answer: (B)

B

Answer 2

When a sphere is rotating in a vertical circle,
it exerts the maximum outward pull when it is at the lowest point B.
Therefore, tension at B is maximum = Weight $+\frac{mv^2}{R}$
So, the string breaks at point B.