Problem C3:
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 B_{1} at the point r_{1}=R/n_{1} to the
magnetic field B_{2} at the point r_{2}=n_{2}R? That is, if
B_{1}/B_{2} = n_{3}, what is n_{3}?

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