Chapter 30c - Exam 2 Question 15 Hall Effect i - E+ + z y...

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Exam 2 Question 15 – Hall Effect i The electric current is going up (+z), which by convention means that this is the direction of e movement of the positive charges. the movement of the positive charges. However, we know that in a metal the charges that move are the conduction electrons, with a rift velocity the opposite direction ( z + + + - - - E e F q E   drift velocity d in the opposite direction (-z). B F x y + + - - - d - E F Ee BE FF   + + - Be d Fq B  Ch. 30: Induction and Inductance - Part C 1 October 28, 2009 B is into the page (-x) direction! Exam results: 30% (-i), 40% (+i), 30% (+,-j)
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Chapter 30: Induction and Inductance Review of induction, inductors and inductance. HITT question. Self-induction. RL circuits. Energy stored in the magnetic field. nergy density of a magnetic field. Energy density of a magnetic field. Mutual induction – read the textbook. quivalent inductance of inductors connected Equivalent inductance of inductors connected in series and in parallel – added without proof. Ch. 30: Induction and Inductance - Part C 2 October 28, 2009
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Faraday’s Law of Induction An emf is induced when the magnetic field flux changes with time, its value equal to the rate at hich the magnetic field flux changes with time : B d - induced emf - agnetic field flux which the magnetic field flux changes with time : raday’s o Ed s N dt  B magnetic field flux - number of turns N Faraday s law E - induced electric field B BdA   Magnetic flux. Surface defined by a conducting loop. a vector of magnitude A nd direction of the A Ch. 30: Induction and Inductance - Part C 3 October 28, 2009 is a vector of magnitude dA and direction of the area normal. dA
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Faraday’s Law and Lenz’s Law Use Faraday’s law to get the magnitude of the induced emf. B d N dt Use Lenz’s law to get the direction of the induced mf and current emf and current. B d The minus sign symbolizes N dt Lenz’s law. he induced emf opposes the magnetic flux change! Ch. 30: Induction and Inductance - Part C 4 October 28, 2009 The induced emf opposes the magnetic flux change!
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Inductors and Inductance An inductor (usually a solenoid) is used to produce a desired magnetic field. he inductance f the inductor (solenoid) is: The inductance L of the inductor (solenoid) is: B N - current i - agnetic flux L i B magnetic flux - number of turns N the magnetic flux linkage B N is the magnetic flux linkage
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Chapter 30c - Exam 2 Question 15 Hall Effect i - E+ + z y...

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