Discussion
The pitch or coil span factor is less than unity because
Answer: A
Correct answer: the two sides of a coil are not exactly a pole pitch apart
In a short-pitched coil the two sides do not sit under corresponding points of adjacent poles, so their emfs are not exactly in opposition and the resultant is less than twice one of them. The fundamental is reduced slightly, but a chosen harmonic can be reduced almost to nothing, which is why the pitch is shortened deliberately.
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