6) a) The rotor of a slip ring induction motor is connected to an ac source, whereas its stator winding is short circuited. If rotating magnetic field produced by rotor winding rotates clock wise, explain the direction in which the rotor must revolve. b) A three phase induction motor is wound for 6 poles and is supplied from 50 Hz system. Calculate synchronous speed. Speed of the motor when slip is 7%. The rotor frequency when motor runs at 1000 rpm. Prove the rotor current is more at starting than maximum load. '