What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N ? m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
A. 66 A
B. 89 A
C. 61 A
D. 75 A
E. 37 A
Answer: D
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