Task: Text Categorization
Input (English): This quantity is multiplied by the Verdet constant to calculate specific rotation, and this quantity perpendicular to the direction of propagation makes the medium birefringent in the Voigt effect. Small values of this quantity are measured by SQUIDs, and below the critical temperature, it is zero inside superconductors. Ampere's Law relates the tangential component of it integrated around a closed curve, and according to Gauss's Law, the net flux of it through any closed surface is zero. FTP name this field that is caused by a moving point charge.
Output (English): Science