Discussion
The cross-magnetising component of armature ampere-turns after a brush shift is
Answer: D
Correct answer: the total less the demagnetising component
The total ampere-turns are unchanged by the shift - the same current flows in the same conductors. What the shift does is reclassify some of them as demagnetising, so the cross-magnetising remainder is whatever is left. The two components always sum to the total.
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