Dictionary:Law of tangents

{{#category_index:L|law of tangents}} Electrical current lines at a boundary are bent such that

$\rho _{1}\tan \alpha _{1}=\rho _{2}\tan \alpha _{2}$

where $\rho _{1}$, $\rho _{2}$ are the resistivities of the two media and $\alpha _{1}$, $\alpha _{2}$ are the angles that the current flow makes with a normal to the interface.

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