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?

n1 = n2 = Input n3:
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