To see why an MRI utilizes iron to increase the magnetic field created by a coil
Chapter 22, Problem 61(choose chapter or problem)
To see why an MRI utilizes iron to increase the magnetic field created by a coil, calculate the current needed in a 400-loop-per-meter circular coil 0.660 m in radius to create a 1.20-T field (typical of an MRI instrument) at its center with no iron present. The magnetic field of a proton is approximately like that of a circular current loop 0.6501015 m in radius carrying 1.05104 A . What is the field at the center of such a loop?
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