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What is the effect of armature coils at points where brushes are located?

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What is the effect of armature coils at points where brushes are located?

(a) Induces positive emf

(b) Induces negative emf

(c) Induces zero emf

(d) Depends on the speed of rotor

I had been asked this question in my homework.

I want to ask this question from Armature Winding and Commutator topic in division Armature Windings of DC Machines

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The correct answer is (c) Induces zero emf

Easy explanation: Brushes are at magnetically neutral region hence, induced emf due to armature coils at brushes will be equal to zero. As in the magnetically neutral region change in flux will be equal to the zero, emf will not be induced (Faraday’s law).

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