with different path and units. Maxwell Equation curl H = I, meaning a circular Magnetic field, H, results from a straight line current, I. Current I having charge, velocity and time dependencies is a straight wire carrying current that will create the so called tube of magnetic field. Normal current flow, I, is produced by the Electric field, E, which was a result of a Voltage, V, potential. A free space electron current, If, are negative charges that are removed from metal by high ...
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