Discussion
The magnetic neutral axis of a loaded dc machine is where
Answer: C
Correct answer: the resultant flux density in the air gap is zero
A coil crossing this axis has no emf induced by the main field, which is where its current can be reversed most easily. Under load the axis shifts - forward in a generator, backward in a motor - so the brushes, which are fixed, are no longer at the right place unless something restores it.
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