The rotor in a certain electric motor is a flat, rectangular coil with 89 turns

Question

The rotor in a certain electric motor is a flat, rectangular coil with 89 turns of wire and dimensions 2.57 cm by 4.20 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, the rotor carries a current of 10.6 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 an angular speed of 3.72 103 rev/min.

(a) Find the maximum torque acting on the rotor.
0.000815N

Explanation / Answer

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The rotor in a certain electric motor is a flat, rectangular coil with 78 turns of wire and dimensions 2.61 cm by 4.20 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, the rotor carries a current of 10.4 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 an angular speed of 3.45 X 10 ^3 rev/min.
(a) Find the maximum torque acting on the rotor. ______ N

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