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With the brushes on the geometric neutral axis, the armature ampere-turns are

  • A.zero
  • B.wholly cross-magnetising
  • C.wholly demagnetising
  • D.wholly magnetising

Answer: B

The armature field then sits at right angles to the main one and distorts it without opposing it, though saturation makes the net effect slightly demagnetising. Shifting the brushes introduces an axial component deliberately.

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