The frequency output of an operating alternator is controlled by the （）.<br>A:relative speed of the rotor poles<br>B:number of turns of wire in the armature coil<br>C:strength of the magnets used<br>D:output voltage

The frequency output of an operating alternator is controlled by the （）.
A:relative speed of the rotor poles
B:number of turns of wire in the armature coil
C:strength of the magnets used
D:output voltage

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