Chapter 30a

# 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
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.
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
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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