In the figure, four long straight wires are perpendicular to the page with R = 20.0cm, and each wire carrying a current of 8.50A. The currents are into the page in wires 2 and 4 and out of the page in wires 1 and 3. (a) What are the magnitude and direction of the magnetic force per meter of wire length on wire 4 from the other wires?

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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.