Two concentric current loops lie in the same plane. The
Chapter 24, Problem 12P(choose chapter or problem)
Problem 12P
Two concentric current loops lie in the same plane. The smaller loop has a radius of 3.0 cm and a current of 12 A. The bigger loop has a current of 20 A. The magnetic field at the center of the loops is found to be zero. What is the radius of the bigger loop?
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