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faraday and lenz - Faradays Law Lenz Law Return of the...

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Faraday’s Law & Lenz’ Law
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Return of the Jumping Wire
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I N S B F
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N S wire v Remove the battery B I
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Michael Faraday (1791 - 1867)
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Induced current N S v I
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Induced current N S I v v B B I I
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Does there have to be motion? AC Delco - + 1 volt I I (induced)
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Does there have to be motion? AC Delco - + 1 volt I
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Does there have to be motion? AC Delco - + 1 volt I (induced)
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Does there have to be motion? AC Delco - + 1 volt NO!!
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Maybe the B-field needs to change….. B v
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Maybe the B-field needs to change….. B v I
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Maybe the B-field needs to change….. B v I I I
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Magnetic Flux Φ B Induced EMF is caused by a change in the  number of field lines through a loop. Number of field lines is called  magnetic flux. Φ = B A
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Flashbulb N S B
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Faraday’s Law: emf induced = ∆Φ B t Lenz’ Law “battery” that drives the induced current
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The number of loops matters Φ B = N B A
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Size: number of B-field lines that pass through the loop.
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