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Solution


Q.

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)          [2017]
 
1 T+mv2l  
2 T-mv2l  
3 zero  
4 T  

Ans.

(4)

 Centripetal force (mv2l) is provided by tension, so net force on the particle will be equal to tension T.