indicates one reason no one shouldstand under a tree during a lightningstorm. If lightning comes down theside of the tree, a portion can jumpover to the person, especially if thecurrent on the tree reaches a dry regionon the bark and thereafter musttravel through air to reach theground. In the figure, part of the lightning jumps through distanced in air and then travels through the person (who has negligibleresistance relative to that of air because of the highly conductingsalty fluids within the body).The rest of the current travels throughair alongside the tree, for a distance h. If d/h = 0.400 and the totalcurrent is I = 5000 A, what is the current through the person?

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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.