DC Generators
The purpose of providing dummy coils in a generator is

To amplify voltage
To enhance flux density
To reduce eddy current losses
To provide mechanical balance for the rotor

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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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