Problem C12:
Initially the current in a straight wire that is infinite in length
is I0 (see left diagram above). The magnetic field vector a distance d from the
wire is B0. Then the current is changed to n1I0 (see right
diagram above). What is the magnetic field vector at a position that is n2d directly away from the wire?
If the magnetic field vector is n3B0, what is n3?
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