Question

In a vertical circle of radius r, at what point in its path does a particle have tension equal to zero if it is just able to complete the vertical circle?

• A. Lowest point
• B. Highest point
• C. Horizontal point
• D. Any point

Hint:

At the highest point in the vertical circle, the tension in the string is minimal, and it is zero when the particle is just able to complete the circle.

Answer 1

The Correct Option is B

At the highest point of the vertical circle, the gravitational force is acting downward and the centripetal force required to keep the particle moving in the circle is also provided by the tension in the string. At this point, if the particle is just able to complete the circle, the tension in the string will be zero. This is because the only force acting on the particle at this point is gravity, which provides the necessary centripetal force.