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In AC rotating machines, the generated or speed EMF ___________

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In AC rotating machines, the generated or speed EMF ___________

(a) leads Φ by 90°

(b) lags Φ by 90°

(c) is in phase with working flux

(d) lags Φ by 180°

I have been asked this question in class test.

I need to ask this question from Generated EMF in division Principles of Electro mechanical Energy Conversions of Electrical Machines

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The correct answer is (b) lags Φ by 90°

Explanation: e = Emaxcos(ωrt-π/2)

ψ = NΦcosωrt

It reveals that the speed or generated EMF lags by 90° the flux that generates it, and is true when flux is time invariant and is sine distributed in space.

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