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].
The centripetal force experienced by a particle connected to a string revolving in a circular path around a centre is given by,
Where,
F is the centripetal force acting on the particle
m is the mass of the particle.
v is the speed of the particle and
l is the length of the string.
Here, the tension produces in the spring provides the centripetal force required by the body to stay in a circular motion.
Thus, the net force on the particle is given as,
Where,
T is the tension in the string.