A series d.c. motor has a field coil resistance of 1.0 Ω and an armature coil resistance of 0.5 Ω. It takes a current of 20 A fiom a 250 V supply when running at a speed of 1000 revlmin. At what speed will it run when a 3.5 R resistance is placed in series with the motor if the same current is taken as before?
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