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A long, cylindrical conductor of radius R carries a current I as shown in the figure below. The current density J, however, is not uniform over the cross-section of the conductor but is function of the radius according to J 5b2, where b is a constant. Find an expression for the magnetic field magnitude B at the following distances, measured from the axis. (Use the following variables as necessary: uo, r1, r2, b, R.) (a) ri R (b) R Need Help? Read It

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