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If the current in the coil is DC, then MMF doesn’t vary with ____________

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If the current in the coil is DC, then MMF doesn’t vary with ____________

(a) space

(b) time

(c) both space and time

(d) none of the mentioned

This question was posed to me in exam.

This key question is from MMF Produced by Distributed Windings topic in portion Synchronous Machines of Electrical Machines

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Right answer is (c) both space and time

To explain: If the coil current is DC, the magnitude of MMF wave does not vary with time and space.

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