A wire carrying a current is shaped in the form of a circular loop of radius 3.0mm. If the magnetic field strength that this current produces at the center of the loop is 1.1mT a) what is the magnitude of the current that flows through the wire? b) If more wire is fed into the loop so that it remains circular and the magnetic field strength at its new center is 0.25mT (assuming negligible change in current), how much wire was fed into the loop?

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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.