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1.
A coaxial cable consists of a solid inner conductor of radius a =0.2 m carrying total current of
5A, surrounded by a concentric cylindrical tube of inner radius b=0.4 m and outer radius
c=0.6m carrying current of 5A. The conductors carry equal and opposite currents I distributed
uniformly across their cross-sections. Determine the magnetic field at a distance r=0.5m from
the axis.

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