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Eddy current
An Eddy Current is a phenomenon caused by a moving magnetic field intersecting a conductor. The moving magnetic field causes a flow of electrons or current in the conductor that creates an opposing magnetic field, an electro-magnet(see Lenz's law.) The stronger the magnetic field and greater the conductivity of the conductor the greater the opposing force. This is used to great effect in movement to electricity converters such as electrical generators and dynamic microphones. Friction within the conductor, or resistance, cause a dragging effect that has been used for braking and damping. Superconductors which allow perfect, loss-less conduction create a perfect eddy current that entirely cancels the opposing magnetic force allowing magnetic levitation.
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