Explore In the AC generated illustrated above, a conducting loop rotates in the magnetic field of two permanent magnets. The magnetic field lines fill the gap from north to south. As the loop rotates, the magnetic flux through the loop changes from maximum in a given orientation to zero, then to maximum in the opposite orientation. This produces an induced voltage in the loop that is sinusoidal, where N is the number of turns in the rotating loop (N = 1 in the animation), B is the magnetic field produced by the permanent magnets, A is the area of the rotating loop, and ω is the angular frequency of the rotating loop.4

We will use a video to study faraday’s law of electromagnetic induction by analyzing the induction that occurs due a coil of copper wire sliding along an air track that passes through an external magnetic field. specifically, we will: examine some of the main principles behind faraday’s law. apply lenz’s law to determine the direction of the induced emf. take measurements of the induced emf from the voltmeter as the coil passes into and out of the external magnetic field. use the horizontal scale provided to determine the speed of the coil. calculate the magnetic field induced in the coil as it passes into and out of the external magnetic field.