text: A bar being dragged down a metal rail by a constant external force may have an exponential decreasein its velocity because of this law.
full_question: A bar being dragged down a metal rail by a constant external force may have an exponential decreasein its velocity because of this law. This equation explains how skin and proximity effects create eddies thatheat up metals. A commutator and a rotating solenoid are used to generate power in a commonapplication of this equation. This law gives the magnitude of the step-up or step-down in voltage from a(*) transformer. This law has a minus sign as a consequence of Lenz's law. It sets the electromotive force equal tothe negative time derivative of the B flux through a current loop. For 10 points, name this equation giving theinduced voltage from a change in magnetic field, the only one of Maxwell's equations named for an Englishscientist.
first_sentence: A bar being dragged down a metal rail by a constant external force may have an exponential decreasein its velocity because of this law.
raw_answer: Faraday's law of induction