One end of the 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 a circle with speed v, the net force on the particle (directed towards the centre) will be: (T represents the tension in the string)

1. T

2. $T+\frac{m{v}^2}{l}$

3. T-$\frac{m{v}^2}{l}$

4. Zero