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In a DC machine, how coil-side emf varies towards the outer side of poles?

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In a DC machine, how coil-side emf varies towards the outer side of poles?

(a) Decreases

(b) Remains same

(c) Increases

(d) First increases the decreases

The question was asked by my college director while I was bunking the class.

My doubt stems from Armature Winding and Commutator in portion Armature Windings of DC Machines

1 Answer

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Best answer
The correct answer is (a) Decreases

Best explanation: Coil side current pattern is the same as the emf pattern. Only difference is that while the coil-side emf reduces towards the outer side of poles, the current remains the same in all the coil-sides except for alterations from pole to pole, while the coil side current reverses, the current exchanged with external circuit must be unidirectional.

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