You are given the task of designing a solenoid that must produce a field in its interior that is 20 times larger than the Earth’s field (BEarth = 5 x 10-5 T). This solenoid is to be 10 cm long and 1.0 cm in diameter, with N = 500 turns. What current must the wire be able to carry without failing?   Recognize the principle: Sketch the Problem: Identify the relationships/ Equation: Solution:

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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.