When a conductor moves in a magnetic field, a voltage will be induced in the conductor and causes current to flow. Current is also induced if the the conductor is held still but the magnetic field moves relative to the conductor.
The direction of the current depends on the direction of the magnetic field and the relative movement of the field. The strength of the voltage depends on the density of the flux line (how strong the magnetism field is) and the speed of the movement. The highest induced strength is achieved when the line cut the force field in right angle. If the wire move in the same direction as the force field, no voltage is induced.
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