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The armature of a d.c. machine has a resistance of 0.25 2 and is connected to a 300 V supply. Calculate the e.m.f. generated

The armature of a d.c. machine has a resistance of 0.25 2 and is connected to a 300 V supply. Calculate the e.m.f. generated when it is running: (a) as a generator giving 100 A, and (b) as a motor taking 80 A.

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