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Demonstrate that the law if refraction o...

Demonstrate that the law if refraction of direct current lines at the boundary between two conducting media has the form `tan alpha_(1) sigma_(2)//sigma_(1)`, where `sigma_(1)` and `sigma_(2)` are the conductivies of the media, `alpha_(2)` and `alpha_(1)` are the angles between the current lines and the normal of the boundary surface.

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