You are given two identical iron rods, one of which is magnetized and the other is not. How can you determine which is the magnet without using a third magnet (for example, Earth)? (b) Devise your own experiment that would determine whether a certain material is diamagnetic or paramagnetic. (c) Does it take more work to cause the same current to run through a coil of wire or through the same wire when it is straightened? Why? (d) You are given a wire of certain length and asked to wind it in the form of a solenoid in a way that maximizes the self-inductance. You may change the radius of the core and the number of turns per unit length, but must take into account that the wire has a certain fixed thickness. What should you do? (e) If you have two parallel wires carrying currents, then the nature of the force (attraction or repulsion) depends on whether the currents flow in the same or opposite directions. Can you interpret this in terms of the magnetic energy density in the region between the 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.