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A DC shunt generator delivers a load current of 30 A at 200 V with its field circuit resistance being 40 ohms and its armature circuit resistance being 1.5 ohms. The generator has a linear excitation and the rotor speed is constant. The brush voltage drop is negligible. Aiding with adequate drawing of the equivalent circuit, estimate:

The field current required, hence the field circuit resistance setting when the generator delivers 50 A at 200 V.