Discussion
Shifting the brushes of a generator forward by an angle \( \theta \) makes the demagnetising component of armature ampere-turns per pole
Answer: C
Correct answer: \( AT \times 2\theta/180 \) for a total of \( AT \) per pole
A shift of \( \theta \) mechanical degrees brings the conductors within \( 2\theta \) of the pole axis into direct opposition to the main field, and those occupy the fraction \( 2\theta/180 \) of a pole pitch. Only that fraction demagnetises; the rest continues to act across the field.
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