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2049_ch30A - Chapter 30 Electromagnetic Induction PHY2049...

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PHY2049: Chapter 30 1 Chapter 30: Electromagnetic Induction
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PHY2049: Chapter 30 2 Subjects Î Induced emf Faraday’s law (law #3 of electricity and magnetism) Lenz’s law Motional emf Î Magnetic energy Î Inductance Î RL circuits Î Generators, transformers
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Changing magnetic field produces current in a wire loop. Induced current i depends on: rate of change of B wire resistance Induced emf that drives i depends only on the rate of change of B Direction of emf depends on: direction of B whether B increases or decreases { Faraday and Henry’s Discovery {
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PHY2049: Chapter 30 4 Electric flux = A d B Φ r r B = A d E Φ r r Magnetic flux Surface defined by a conductive loop Closed surface (Gaussian surface) (N m 2 /C) (T m 2 ) Î 1 T m 2 = 1 weber = 1 Wb θ BA Φ cos B = if B is uniform and surface is flat. Magnetic Flux
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PHY2049: Chapter 30 5 Faraday’s Law (Law #3 of E&M) dt Φ d N B ε = emf Î Use Faraday’s law to calculate only the magnitude Î Use Lenz’s law to find the direction # of turns of the loop Flux through the loop
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