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To see why an MRI utilizes iron to increase the magnetic field created by a coil,...

To see why an MRI utilizes iron to increase the magnetic field created by a coil, calculate the current in amperes needed in a 420-loop-per-meter circular coil 0.660 m in radius to create a 1.30 T field (typical of an MRI instrument) at its center with no iron present.

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The magnetic field of a proton is approximately like that of a circular current loop 0.650 ✕ 10−15 m in radius carrying 1.05 ✕ 104 A. What is the field in teslas at the center of such a loop?

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