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What does the space angle α in the equation Fr(α,t)=3/2Fmcos(α-ωt) for MMF produced when 3-phase balanced windings excited by three phase balanced currents represent?

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What does the space angle α in the equation Fr(α,t)=3/2Fmcos(α-ωt) for MMF produced when 3-phase balanced windings excited by three phase balanced currents represent?

(a) MMF wave at any moment is sinusoidally distributed in space

(b) Entire MMF waveform is travelling at (constant angular speed) synchronous speed

(c) MMF wave is of constant amplitude

(d) None of the mentioned

I have been asked this question in unit test.

I'm obligated to ask this question of Rotating Magnetic Field in chapter Basic Concepts in Rotating Machines of Electrical Machines

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The correct choice is (a) MMF wave at any moment is sinusoidally distributed in space

Explanation: The space angle α means that MMF wave at any moment is sinusoidally distributed in space along the air-gap periphery.

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