Demonstrate that the law if refraction of direct current  lines at the boundary between two conduct
Channel: Doubtnut
Date: 2020-08-23

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.