9. (10 pts.) Assume that a motor in which the coil has a total resistance of 40

Question

9. (10 pts.) Assume that a motor in which the coil has a total resistance of 40 Ohm is supplied a voltage of 120 V. When the motor is running at its maximum speed, the back emf is 40 V. (a) What is the power? Answer: (b) What is the power when the motor is running at one-half the maximum speed? Answer: 10. (5 pts.) Find the magnetic energy stored in the air gap between two very large magnetic pole pieces. one North, one South, each with an area of 100 cm^2, Assume the 0.04 T magnetic field is uniform within the 3-cm gap. Answer:

Explanation / Answer

9.a] power, P = I2R = Vnet2 /R = [120V-40V]2 / 40 ohm = 160 W

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