Show that the external inductance per unit length of a two-wire transmission line carrying equal and opposite

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Show that the external inductance per unit length of a two-wire transmission line carrying equal and opposite currents is approximately (μ/π) ln(d/a) H/m, where a is the radius of each wire and d is the center-to-center wire spacing. On what basis is the approximation valid?

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Engineering Electromagnetics

ISBN: 978-0073380667

8th edition

Authors: William H. Hayt, John A.Buck

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