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NEET 2017 · Circular Motion (Related PYQs)

Circular Motion (Related PYQs) question from NEET 2017

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Circular Motion (Related PYQs)

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)

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Answer: (d)

On a smooth horizontal table, weight and normal reaction cancel.
The only horizontal force is the tension, directed towards the peg (centre).
Net centripetal force $= T$ $\left(= \frac{mv^2}{l}\right)$ , so the answer is (d).

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