The accompanying figure shows a cross-section of a long, hollow, cylindrical conductor of inner radius r1=1.3-cm and outer radius r2=7.6- cm. A 80.0-A current distributed uniformly over the cross-section flows into the page. 12 Calculate the magnetic field at r=0.5 cm. Calculate the magnetic field at r=4.5 cm, T. Calculate the magnetic field at r=9 cm. T T.

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