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Question -

One end of a string of length l is connected to a particle of mass m and the other to a small peg on a smooth horizontal table. If the particle moves in a circle with speed v the net force on the particle (directed towards the centre) is:
(i) T, (ii)  , (iii)  , (iv) 0
T is the tension in the string. [Choose the correct alternative].



Answer -

When a particle connected to a stringrevolves in a circular path around a centre, the centripetal force is providedby the tension produced in the string. Hence, in the given case, the net forceon the particle is the tension T, i.e.,

T = 

Where F isthe net force acting on the particle.

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