Imagine a cylindrical hollow tube made of copper. First, a metallic (but not magnetic) capsule of mass m is dropped as the tube is held vertical and it takes t1 seconds between the entrance and exit. Then, an identical but magnetized capsule of mass m and identical shape as the previous one is dropped into the tube as the previous one and it takes t2 seconds between the entrance and exit. What would happen if we had used an insulating tube instead? a) What is the relation between t1 and t2? (i.e., are they equal or if not, which one is greater than the other?)  b) Why? (Explain)

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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.