Question: A certain 4 8 0 - V - rms delta - connected synchronous motor operates with zero developed power and draws a phase current of

A certain 480-V-rms delta-connected synchronous motor operates with zero developed power and draws a phase current of 15 A rms, which lags the voltage. The synchronous reactance is 5. The field current is 5 A. Assuming that the rotor field magnitude is proportional to field current, what field current is needed to reduce the armature current to zero?

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