Question: A direct current of density j flows along a round uniform straight wire with cross-section radius R. Find the magnetic induction vector of this current

A direct current of density j flows along a round uniform straight wire with cross-section radius R. Find the magnetic induction vector of this current at the point whose position relative to the axis of the wire is defined by a radius vector r. The magnetic permeability is assumed to be equal to unity throughout all the space.

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