Task: Text Categorization
Input (English): The Cotton-Mouton effect results when it is applied to liquids, while in solids its application results in the Voigt effect, sometimes known as its namesake birefringence. Applying it to metals induces the formation of Landau levels to allow for the measurement of Fermi surfaces, and the propagation of light along the direction of one results in an angular shift proportional to the Verdet constant and is known Faraday rotation. The Lorentz equation gives the force exerted by it on a moving charge, and it is divergence free and can be given as the curl of the vector potential. FTP, identify this field which can be calculated from Ampere's law, the counterpart of the electric field.
Output (English): Science