Suppose you wish to measure the current in a wire.  You have a device that can measure the strength of the magnetic field produced by the wire, but the device does not directly measure the current.  If the device is place 2.22m away from the wire, and the magnetic field strength is 0.87, what is the current running through the wire in Amps?

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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.