In a popular lecture demonstration, a cylindrical permanent magnet is dropped down a long aluminum tube as shown above. Neglecting friction of the magnet against the inner walls of the tube assuming that the tube is very long compared to the size of the magnet, will the magnet accelerate downward with an acceleration equal to a free fall? If not, describe the eventual motion of the magnet. Does it matter if the north pole or south pole of the magnet is on lower side?

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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.