An infinitely long conductive wire of radius a is inside an infinitely long and very thin sheath of radius b. Constant I current goes from the conductor wire and returns from the cylindrical sheath. The current density is assumed to be uniform at the wire and sheath. Write the expressions of the magnetic field that are valid inside the wire, between the wire and the sheath and outside the sheath.

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Magnetic Field Of Coaxial Cable

The word coaxial means same axis. So for a long straight cable to be coaxial, it must have concentric cylindrical shaped conductor around it. Coaxial cable (popularly called ‘coax’) has various applications ranging from current conductors to radiofrequency signal transmitters. This cable has lower emission losses and provides protection from electromagnetic interference which allows signals with less power to transmit over longer distances.For example, currents produced in the pickup of a stereo turntable generally travel to the amplifier through a coaxial cable.The self-inductance of a coaxial cable is another important characteristic, because it influences the propagation of electrical signals in the cable.