What Current Must Be Maintained in a Square Loop (50 $\degree$

question 44

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 centre and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40 $\degree$ 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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