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The definition of tlie resistance of a coil is simple for direct current and may be given directly in terms of Ohm 's Law. Similarly, the computation of the resistance of a coil made of a wire of known length, cross section, and material is quite easy for direct current. The same problem becomes difficult if an alternating current of high frequency is used instead of a direct current. It is shown in this paper that a different definition of resistance must be given ; that the value of thedoi:10.1016/s0016-0032(22)90535-6 fatcat:rfjxnlb3mnejreud4mrgxbt4ei