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Brushes are set on the neutral axis so that the coil being commutated

  • A.has the largest possible emf induced in it
  • B.carries the whole of the armature current
  • C.is disconnected from the winding entirely
  • D.has no emf induced in it by the main field

Answer: D

A coil short-circuited by a brush while sitting in the main flux would carry a large circulating current, so it must be commutated where the flux is zero. That is why the neutral axis matters and why its shift with load is such a nuisance.

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