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Electromagnetic Induction (EMI). AP Physics. Electromagnetic Induction (EMI). A changing magnetic field can induce a current in a circuit called the induced current . The corresponding emf that must be present to cause the current is the induced emf . What Causes Induction.

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## Electromagnetic Induction (EMI)

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**Electromagnetic Induction(EMI)**AP Physics**Electromagnetic Induction (EMI)**A changing magnetic field can induce a current in a circuit called the induced current. The corresponding emf that must be present to cause the current is the induced emf.**Magnetic Flux (φm)**The amount of magnetic field there is in an area. (The number of magnetic field lines in an area.) Units of φm: Only the components of magnetic field that are perpendicular to the area contribute to the flux. θ**Magnetic Flux (φm)**θ θ θ**Faraday’s Law**But wait…to have induction there must be a change in the magnetic field (therefore a change in the magnetic flux)!! “The induced emf in a circuit equals the rate of change of the magnetic flux through the circuit.”**Flux Problem**The U-shaped conductor lies perpendicular to a uniform magnetic field B with magnitude B = 0.60 T, directed into the page. We lay a metal rod with length L = 0.10 m across the two arms of the conductor, forming a conducting loop, and move the rod to the right with constant speed v = 2.5 m/s. What is the magnitude of the resulting emf?**Generators**A device that converts mechanical energy to electrical energy. Alternating current generator (alternator)**Lenz’s Law**“The direction of any magnetically induced current or emf is such as to oppose the direction of the phenomena causing it.”**Lenz’s Law**Lenz’s Law requires some thinking!**Motional emf**The induced emf in a circuit equals the rate of change of the magnetic flux through the circuit.**Transformers**A device that converts voltage.**Physics Rock Band**Electromagnetic Induction is used to ROCK OUT!! • Microphones**Physics Rock Band**Electromagnetic Induction is used to ROCK OUT!! • Electric Guitar**Physics Rock Band**Electromagnetic Induction is used to ROCK OUT!! • Cassette Tapes (kickin’ it old school)

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