What Current Must Be Maintained in a Square Loop (50

question 60

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

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