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    Ampere's law: Magnetic field due to a coaxial cable.

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    A coaxial cable consists of a solid inner conductor of radius R1, surrounded by a concentric cylindrical tube of inner radius R2 and outer radius R3. The conductors carry equal and opposite currents I distributed uniformly across their cross-sections. Determine the magnetic field at a distance R from the axis for:

    a) R < R1,
    b) R1<R<R2,
    c) R2<R<R3,
    d) R> R3.

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    Solution Summary

    A coaxial cable carrying a current through it, the magnetic field at all positions is calculated using Ampere's law.