Question: Two concentric current loops lie in the same plane. The smaller loop has a radius of 2.7 cm and a current of 12 A.

Two concentric current loops lie in the same plane. The smaller loop has a radius of 2.7 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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