The figure shows the orientation of a rectangular loop consisting of 80 closely wrapped turns each carrying a current I. The magnetic field in the region is (
) mT. The loop can turn about the y axis. If ? = 30°, a = 0.40 m, b = 0.30 m, and I = 8.0 A, what is the magnitude of the torque exerted on the loop?
A. 2.5 N ? m
B. 1.5 N ? m
C. 3.1 N ? m
D. 2.7 N ? m
E. 0.34 N ? m
Answer: D
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