Pathfinder Magnetism BYU 5

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A uniform electric field is established inside a long cylindrical straight rod along its axis. Energy density of this electric field is uniform and is equal to ue = 2x10 -17 J/m3. Inside the rod, energy density of magnetic field is nonuniform and assumes a value ub =0.4 J/m3 at a distance r = 2 cm from the axis of the rod. Find electrical resistivity of the material of the rod.