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The armature current of a synchronous motor is given by

  • A.\( Z_s/(V - E) \)
  • B.\( (V - E)/Z_s \) as a phasor difference
  • C.\( (V + E)/Z_s \)
  • D.\( VE/Z_s \)

Answer: B

The net voltage acting round the armature circuit is the phasor difference between the applied voltage and the back emf, and the synchronous impedance limits the current it drives. Both the magnitude and the phase of that difference matter.

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