Discussion
In a 3-phase induction motor, the slip speed is ______.
Answer: A
The slip speed of an induction motor is the difference between the speed of the rotating magnetic field and the speed of the rotor.
\[ N_{slip} = N_s - N_r = sN_s \]
Because the rotor always runs a little slower than the synchronous speed, \(N_s - N_r\) is positive, so the order in option A is the one that gives a positive slip. Option B gives the negative of it, and the rotor speed or the synchronous speed alone is not a slip speed. The answer is option A.
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