Definition: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Input: One result of this effect was explained by the creation of quasiparticles in a quantum fluid by Laughlin, and Dyakonov and Perel predicted a version of it dependent on spin. It can be used to find hole density in a semiconductor, and von Klitzing showed that under certain situations this effect is quantized. This effect distinguishes between a negative current and a positive current flowing in the opposite direction, and it creates a Lorentz force, resulting in the deflection of charge carriers by a magnetic field. For 10 points, name this effect in which a potential difference is created across a conductor by a perpendicular magnetic field.
Output:
Science