Which of the following is a factor that causes the magnetic field of a three-phase motor to rotate?
a. The voltages of a three-phase system are 90 degrees out of phase with each other.
b. The three voltages change polarity at regular intervals.
c. The pole pieces are wound such that they will always have the same magnetic polarities.
d. The stator windings are arranged around the outside of the motor.
b. The three voltages change polarity at regular intervals.
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