What Current Must Be Maintained in a Square Loop (50

Multiple Choice

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