Final answer:
In an induction motor, the synchronous speed determines motor efficiency and performance, with rotor speed slightly slower creating slip.
Explanation:
In an induction motor, the speed of rotation of the magnetic field is called the synchronous speed, denoted by Ns. This speed is essential in determining the motor's efficiency and performance. The rotor of the motor rotates slightly slower than the synchronous speed, creating a slip between the two speeds.
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