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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 needed in a 460–loop–per–meter circular coil 0.600 m in radius to create a 1.40–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 6.800×10-16 m in radius carrying 1.02×104 A. What is the field at the center of such a loop?

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