A flat rectangular wire loop is positioned next to a long straight current-carrying wire. Both the loop and the wire are in the plane of the page, and the direction of the current is clearly indicated in the figure. How does the magnitude of the magnetic field change as the perpendicular distance from the wire, (r) increases? From Ampère's Law we know that the magnitude of the magnetic field increases in direct proportion to the perpendicular distance, that is, Bocr. From Ampère's Law we know that the magnitude of the magnetic field decreases as an inverse proportion to the square of the perpendicular distance, that is, Bxc1/r^2. From Ampère's Law we know that the magnitude of the magnetic field decreases as an inverse proportion to the perpendicular distance, that is, Bxc1/r. From Ampère's Law we know that the magnitude of the magnetic field increases in direct proportion to the square of the perpendicular distance, Bocr^2.

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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.