Demonstrate that the law of refraction of direct current lines at the boundary between two conducting media

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Demonstrate that the law of refraction of direct current lines at the boundary between two conducting media has the form tan az/tan a1 = σ2/σl, where σ1 and σ2 are the conductivities of the media, a2 and a1 are the angles between the current lines and the normal of the boundary surface.
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Fundamentals of Applied Electromagnetics

ISBN: 978-0132139311

6th edition

Authors: Fawwaz T. Ulaby, Eric Michielssen, Umberto Ravaioli

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