A ring of radius 8.0 cm is placed concentrically around a ring of radius 6.0 cm (see figure  below). Each ring carries a current of 4.0 A. (a) What is the magnitude of the magnetic field at the center of the rings if the two currents flow in the  same direction? (b) Find the magnitude of the magnetic field if the currents flow in opposite directions? (c) If the outer ring current is counterclockwise and the inner

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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.