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A pump motor has two modes of operation - high and low speed. When the motor operates in high speed, is has an angular speed

A pump motor has two modes of operation - high and low speed. When the motor operates in high speed, is has an angular speed of 300 rad/s. At low speed, it has an angular speed of 150 rad/s. The motor operates at a nominal voltage of 120 V for high speed; for low voltage is reduced to 112 V. What is the back EMF that is produced for each of the modes?

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