Because torque depends on the strength of the magnetic field of the armature, which, in turn, depends on the armature current, any increase in mechanical load requires an increase in the armature current, more load, slower speed, higher differential, and more current.

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This is because torque is directly proportional to armature current and magnetic field strength, so an increase in load requires a stronger magnetic field, which can only be achieved by increasing the armature current. This results in a decrease in speed due to higher differential and more current being drawn.

Because Torque Depends on the Strength of the Magnetic Field