Surface of wire I Find the magnetic field inside and outside a long straight wire as a function of r. long straight wire has current density of j that is proportional to $r^2$
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Since the current density is proportional to r^2, we can write the current density as j = kr^2, where k is a constant. The current flowing through a small section of the wire can be calculated by integrating the current density over the cross-sectional area of the Show more…
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