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If the current in a coil is AC, the amplitude of MMF ___________

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If the current in a coil is AC, the amplitude of MMF ___________

(a) varies with time but not with space

(b) varies with space but not with time

(c) varies with both space and time

(d) doesn’t vary with both space and time

The question was posed to me in unit test.

The doubt is from MMF Produced by Distributed Windings in division Synchronous Machines of Electrical Machines

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The correct choice is (a) varies with time but not with space

Explanation: For AC in the coil, the air-gap MMF wave is time variant but space invariant.

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