A current is set up in a wire loop consisting of a semicircle of radius 4.00 cm, a smaller concentric semicircle, and two radial straight lengths, all in the same plane. the arrangement but is not drawn to scale. The magnitude of the magnetic field produced at the center of curvature is 47.25 mT. The smaller semicircle is then flipped over (rotated) until the loop is again entirely in the same plane .The magnetic field produced at the (same) center of curvature now has magnitude 15.75 mT, and its direction is reversed from the initial magnetic field.What is the radius of the smaller semicircle?

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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.