DC Generators
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralized by all of the following except

Compensating winding
Dummy coils
Interpoles
Shifting of axis of brushes

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

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

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