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When the length of this line is equal to λ / 4 (λ - wavelength of the electromagnetic wave in the coil), the line is in resonance mode and the frequency corresponding to this wavelength is called the self-resonant frequency of the coil. As is known, such a structure is defined as the small inductances and capacitances distributed along the line length. Nicola Tesla The self-capacitance of a single-layer air core solenoidĪt high frequencies, the inductor would be correctly represented as a helical single-wire transmission line. Is there, I ask, can there be, a more interesting study than that of alternating currents