Two long wires separate by a distance 2a = 4 cm, parallel to the x axis, are crossed by the same current i 50A along the positive x axis. Calculate the magnetic field B(z) on the axis of the two wires and at what distance from the center O a small magnetic needle oriented parallel to B is affected by a zero force.

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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.