Chapter 30a - Announcements Exam results. There is no...

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Announcements Exam results. There is no homework due on Monday. Next homework (Ch.30+Ch.31A) due Nov. 2. No quizzes next week. October 23, 2009 Ch. 30: Induction and Inductance - Part A 1
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Chapter 30: Induction and Inductance Induced emf, induced current and electromagnetic induction experiments. Faraday’s law of induction. Lenz’s law. Motional emf. HITT. October 23, 2009 Ch. 30: Induction and Inductance - Part A 2
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Electromagnetic Induction A magnetic field can produce an electric field that can drive a current. The magnetic field and the electric field it produces (induces) is described by Faraday’s w of induction law of induction. Faraday discovered that a changing magnetic ux leads to a voltage in a wire loop This flux leads to a voltage in a wire loop. This induced voltage (emf) causes a current to flow! October 23, 2009 Ch. 30: Induction and Inductance - Part A 3
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Electromagnetic Induction Experiments A conducting loop is connected to an ammeter. There is no battery in the circuit, so no current. If bar magnet is moved toward the loop a current a bar magnet is moved toward the loop, a current suddenly appears. The current disappears when the magnet stops moving. A current appears only if there is a relative motion between the loop and the magnet. Faster motion produces faster current. Moving the bar magnet’s north pole into the op produces clockwise current in the loop; loop produces clockwise current in the loop; moving the bar away produces CCW current. Moving the south pole of the magnet toward nd away from the loop produces currents in October 23, 2009 Ch. 30: Induction and Inductance - Part A 4 and away from the loop produces currents in the reversed directions.
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Moving Bar Magnet with North Pole Facing Loop Exp. 1A bar north ward toward loop Exp. 1B bar north away from loop October 23, 2009 Ch. 30: Induction and Inductance - Part A 5
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Moving Bar Magnet with South Pole Facing Loop Exp. 1C bar south ward toward loop Exp. 1D bar south away from loop October 23, 2009 Ch. 30: Induction and Inductance - Part A 6
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Electromagnetic Induction Induced current – the current produced in the loop. Induced EMF – the work done per unit charge to roduce the current (to move the conduction produce the current (to move the conduction electrons that constitute current). duction e process of producing the induced Induction the process of producing the induced current and EMF.
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This note was uploaded on 03/12/2010 for the course PHY PHY taught by Professor Mueller during the Spring '09 term at University of Florida.

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Chapter 30a - Announcements Exam results. There is no...

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