A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it.
A. 0.41 N ? m
B. 0.14 N ? m
C. 0.38 N ? m
D. 0.27 N ? m
E. 0.77 N ? m
Answer: C
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