The figure above shows a cylindrical wire of radius R. The wire is infinitly long and
has a total current I. The current I is uniformly distributed in the wire.
What is the ratio of the magnetic field B1 at the point r1=R/n1 to the
magnetic field B2 at the point r2=n2R? That is, if
B1/B2 = n3, what is n3?
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