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A series motor runs at 800 rev/min when the voltage is 400 V and the current is 25 A. The armature resistance is 0.452

A series motor runs at 800 rev/min when the voltage is 400 V and the current is 25 A. The armature resistance is 0.452 and the series field resistance is 0.2 12. Determine the resistance to be connected in series to reduce the speed to 600 rev/min with the same current.

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