Torque: A flat circular loop of wire is in a uniform magnetic field of 0.30 T. The diameter of the loop is 1.0 m, and a 2.0-A current flows in it. What is the magnitude of the magnetic torque on the loop when the plane of the loop is parallel to the magnetic field?
A. 0.00 N ? m
B. 0.41 N ? m
C. 0.47 N ? m
D. 0.52 N ? m
Answer: C
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