JEE Main · PhysicsHard
A particle of mass $m$ is attached to a light string of length $l$ and is moving in a vertical circle. If the tension in the string at the highest point is zero, the tension at the lowest point is:
- A.$2mg$
- B.$4mg$
- C.$6mg$
- D.$5mg$
Show correct answer & step-by-step solution
Correct answer: C — $6mg$
Solution
At the top, . By energy conservation, . At the bottom, , yielding .
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