(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The rotor in a certain electric motor is a flat, rectangular coil with 80 turns of wire and dimensions 2.50 cm by 4.00 cm. The rotor rotates in a uniform magnetic field of 0.800 T. When the plane of the rotor is perpendicular to the direction of the magnetic field, it carries a current of 7.5 mA. In this orientation, the magnetic moment of the rotor is directed opposite the magnetic field. The rotor then turns through one-half revolution. This process is repeated to cause the rotor to turn steadily at 3600 rev/min.

(a) Find the maximum torque acting on the rotor.

(b) Find the peak power output of the motor.

(c) Determine the amount of work performed by the magnetic field on the rotor in every full revolution.

(d) What is the average power of the motor?

3. The attempt at a solution

I have solved part A) and found the max torque to be 4.80 e(-4) Nm. I am stuck on part b. I can find the max and min potential energy of the system but I don't know how that would help. Not sure how to go about this part.

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# Torque, magnetic field

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