The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12 A, what is the magnitude of the torque exerted on the loop?
?
?
A. 8.1 N ? m
B. 24 N ? m
C. 22 N ? m
D. 13 N ? m
E. 16 N ? m
Answer: A
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