State the Lenz's Law.
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Lenz's law states that the current induced in a circuit due to a change in a magnetic field is directed to oppose the change in flux and to exert a mechanical force which opposes the motion. ... This means that the direction of the back EMF of an induced field opposes the changing current that is its cause.
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Lenz's law is named after Heinrich Lenz, and it says: An induced electromotive force (emf) always gives rise to a current whose magnetic field opposes the change in original magnetic flux. ... The direction of the induced emf is always such as to result in opposition to the change producing it.
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