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
With the increase in speed of DC motor

 Both back emf as well as line current fall.
 Back emf falls and line current increase.
 Both back emf as well as line current increase.
  Back emf increase but line current falls.

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