Question: Two concentric current loops lie in the same plane. The smaller loop has a radius of (3.0 mathrm{~cm}) and a current of (12 mathrm{~A}). The

Two concentric current loops lie in the same plane. The smaller loop has a radius of $3.0 \mathrm{~cm}$ and a current of $12 \mathrm{~A}$. The bigger loop has a current of $20 \mathrm{~A}$. 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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