A Current of 4

Multiple Choice

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