Electrical Machines
In DC machine yoke offers

 both A and B
 mechanical protection to the machine
 flux path completion
 produce working flux

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 decreases in generators and increases in motor with load.
 increases in both the generators and the motors with load.
  decreases in both generators and the motors with load.
 increases in generators but decreases in motor with load.

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