When 3 phase ac supply is given to stator of the induction motor rotating magnetic field will be generated. This magnetic field (flux) cuts the stationary conductors of the rotor of induction motor. Therefore an emf is induced by Faraday’s law of electro-magentism. As the rotor conductors are short circuited, current starts flowing in the windings of the rotor this produces a magnetic field. Due to interaction of both the magnetic fields a torque will be developed. If the torque generated is sufficient to overcome the load torque rotor starts rotating.