Electrical Machines
In a DC generator the actual flux distribution depends upon

  shape of the pole shoe.
 size of air gap.
  all of above.
  clearance between tips of the adjacent pole shoes.

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 the flux waveform is improved with reduction in harmonics
 a counter-emf is induced in the coil undergoing commutation
 the inequality of air-gap flux on the top and bottom halves of the armature is removed
 the interpoles produce additional flux to augment the developed torque

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