calculate the new steady state speed in a dc motor

A wound-field dc motor is driving a load whose torque requirement increases linearly with speed and reaches 5 Nm at a speed of 1,400 rpm. The armature terminal voltageis held to its rated value. At the rated Bf, the no-load speed is 1,500 rpm and the speed while driving the load is 1,400 rpm. If Bf is reduced to 0.8 times its ratedvalue, calculate the new steady state speed.


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