The first move is to identify a conductor which must be moved in a magnetic field to start off the basic energy transfer. When the movement across the magnetic field takes place, a motional emf arises. This is because of the magnetic force that applies itself on the now mobile charges. The mobile charges always move together with the conductor and for this reason they have a velocity of a nonzero on the average. Moreover it is necessary to have a complete circuit since this will act as the platform around which the charges revolve. For these charges to begin their movements, the magnetic field is the source of their force and spurs them to motion.
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