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The cross-section of a long cylindrical shell conductor of inner radius a=2.43 cm and outer radius...

The cross-section of a long cylindrical shell conductor of inner radius a=2.43 cm and outer radius b=7.33 cm carries a current into the page. The current density J (current/area) is uniform across the shell from r=a to r=b and has the magnitude J=3452 A/m2 where r is the distance from the axis of the shell. Find the magnitude of the magnetic field at r=(a+b)/2

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