Instructions: 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: Gaunt coefficients are used to represent scalar coupling when it is lost from cross differentiation, and Clebsch-Gordan coefficients are used for the general addition of this quantity. A paradox named for Feynman involving a coil of wire, through which a current flows, can be resolved by noting the existence of this quantity for static electromagnetic fields. Magnetic field lines reduce this parameter in the Blandford-Znajek process, and when this value is equal to zero, the space-time metric reduces to the Reissner-Nordstrom solutions. Noether's theorem states that if the Lagrangian function is independent of the angle of measurement, then this quantity will be conserved. It can be stated as Iota times Omega, and its time derivative is equal to torque. For 10 points, name this vector quantity that for rotating systems is the product of the moment of inertia and angular velocity.
Output:
Science