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A permanent magnet motor has an armature that contains 100 loops. The armature is circular with a radius of 250 cm. The motor draws a

A permanent magnet motor has an armature that contains 100 loops. The armature is circular with a radius of 250 cm. The motor draws a 10 A of current to produce 20 N-m of torque. What is the strength of the magnetic field produced by the permanent magnet? If the current was reduced to 5 A, how much torque would the motor produce?

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