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Physics · PYQ NEET UG 2017

हिन्दी

One end of string of length \( l \) is connected to a particle of mass \( m \) and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed \( v \), the net force on the particle (directed towards centre) will be (T represents the tension in the string)

  1. \( T \)
  2. \( T + \frac{mv^2}{l} \)
  3. \( T - \frac{mv^2}{l} \)
  4. Zero

Correct answer · Option 1

\( T \)

Explanation

The net force directed towards the centre provides the necessary centripetal force, which is purely supplied by the tension \( T \) in the string.
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