A 230 V series DC motor takes a current of 30 A. The resistance of the feld coil is 0.4 Ω and that of the armature 0.2 Ω. Determine the resistance required in series to reduce the speed by 40% if the current at the new speed is 20 A. Assume that the magnetic fux produced by the feld coil is proportional to the current.
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