You have decided that you love physics and want to construct your own solenoid. You find a plastic tube with a diameter of 8.0 cm and a length of 32 cm. You would like your solenoid to produce a rather large field of 0.35 T inside when you pass a 2.0-A current through the (insulated!) wires. How much wire (total length) do you need to construct this solenoid? [Answer: L = 1.1 × 104 m]

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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.