Solenoids and electromagnets are widely used in power generation and distribution. A solenoid formed from a length of wire has 80 turns. The solenoid carries a constant current of 13 A and the strength of the magnetic field produced is measured to be 7.3×10-3 T at its center. What is the length of the wire that forms the solenoid

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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.