A conducting cylinder has radius ?a and volume current density J1=κr in the direction of the axis of the cylinder where κ is known.  It is coaxial with a conducting cylindrical shell which has inner radius b and outer radius c.   Suppose we have already determined that the magnetic field outside both cylinders is zero.  If the outer cylinder has a current density of J2=αr, find α.   Find the magnetic field in each possible region   B(r

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A: Answer   Given data   C=3×106 A/m4 r2=2 cm r1= 1 cm

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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.