A teacher wants to build another student a giant solenoid of one layer of tightly-wrapped 12-gauge copper wire (diameter is 0.2032 mm). It is to be 3.5 meters tall and square in shape with 0.75-m long sides. He’d like to achieve a 150-mT field inside it. How much current will it need to draw?

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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.