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Chapter 30b

# Chapter 30b - Exam 2 Results avg 13.5 Ch 30 Induction and...

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Exam 2 Results avg. 13.5 Ch. 30: Induction and Inductance - Part B 1 October 26, 2009

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Exam 2 Results Ch. 30: Induction and Inductance - Part B 2 October 26, 2009
Chapter 30: Induction and Inductance Review of induction. Eddy currents. EMF by rotation. HITT question. Induced electric fields. Inductors and inductance. Ch. 30: Induction and Inductance - Part B 3 October 26, 2009

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Faraday’s Law of Induction A f i i d d h h i fi ld fl An emf is induced when the magnetic field flux changes with time, its value equal to the rate at which the magnetic field flux changes with time : B d N - emf - magnetic field flux Faraday’s   dt B magnetic field flux - number of turns N M ti fl law B B dA Magnetic flux. Surface defined by a conducting loop. is a vector of magnitude dA and direction of the dA Ch. 30: Induction and Inductance - Part B 4 October 26, 2009 is a vector of magnitude and direction of the area normal.
How To Create and EMF? B d dt   cos B B dA B dA Change the magnitude of the magnetic field B within the coil. Change the area of the coil or the portion of the coil that lies within the magnetic field (e.g. expand or h i k th il it i d t f th fi ld) shrink the coil, or move it in and out of the field). Change the angle between the direction of the magnetic field and the plane of the coil (e g by Ch. 30: Induction and Inductance - Part B 5 October 26, 2009 magnetic field and the plane of the coil (e.g. by rotating the coil).

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Faraday’s Law and Lenz’s Law U F d ’ l h i d f h Use Faraday’s law to get the magnitude of the induced emf. B d dt Use Lenz’s law to get the direction of the induced emf and current emf and current. B d The minus sign symbolizes dt Lenz’s law. The induced emf opposes the magnetic flux change! Ch. 30: Induction and Inductance - Part B 6 October 26, 2009