Which of the following statements is not one of the three factors that create a rotating magnetic field?

A. The fact that currents change constantly in a three-phase system.
B. The arrangement of the stator windings.
C. The fact that the voltages of a three-phase system are 120 degrees out of phase with each other.
D. The fact that voltages change polarity at regular intervals.

The fact that currents change constantly in a three-phase system is not part of the three factors that create a rotating magnetic field. The key components that contribute to the creation of a rotating magnetic field include the arrangement of the stator windings and the fact that the voltages of a three-phase system are 120 degrees out of phase with each other. Rotating magnetic fields are essential in devices like generators, where the changing magnetic field induces an electric current.

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