DC Generators
In D.C. generators the polarity of the interpoles

Is neutral as these poles do not play part in generating e.m.f.
Is the same as that of the main pole ahead
Is the same as that of the immediately preceding pole
Is opposite to that of the main pole ahead

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DC Generators
Inter-pole flux should be sufficient to

Neutralize the armature reaction flux
Neutralize both the armature reaction flux as well as commutating e.m.f. induced in the coil
None of these
Neutralize the commutating self induced e.m.f.

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