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The amplitude of rotating MMF wave is proportional to ___________

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The amplitude of rotating MMF wave is proportional to ___________

(a) Nph and P

(b) I and P

(c) Nph and I

(d) Nph, I and P

The question was posed to me during an online interview.

I want to ask this question from Rotating Magnetic Field in section Basic Concepts in Rotating Machines of Electrical Machines

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Best answer
The correct answer is (c) Nph and I

Best explanation: FR = 3/(2Fm) = 3/(2 4√2/(ΠKw NphI/P)

where  Nph = series turns per phase and I = RMS current.

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