lecture24 - Magnetic Induction(chapter 31 Magnetic...

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Unformatted text preview: Magnetic Induction (chapter 31) Magnetic Induction (chapter 31)- an emf is induced in a circuit placed in a magnetic field which is changing with time- An emf is induced in a circuit which moves in a magnetic field Rules: Faraday’s Law, Lenz’s Law Practice: Chapter 31, problems 3, 5, 9, 11, 59 V Induction Move a magnet at constant speed through a coil attached to a voltmeter: S N v V position x voltmeter reading S N B Rule Rule (Faraday’s Law): (Faraday’s Law): When the magnetic flux through a circuit changes , the emf induced in the circuit is: dt d B Φ − = ε (for a coil with N turns: ) dt d N B Φ − = ε Note Φ B changes if: 1) B changes 2) the area of the circuit changes 3) the orientation of the circuit changes “Area vector” A ε positive The “ The “-” sign ” sign : Choose a direction for A ; then the R.H. rule defines a corresponding “positive” direction for ε ....
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This note was uploaded on 12/03/2009 for the course CHEMISTRY 1E03 taught by Professor Britz during the Spring '09 term at McMaster University.

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lecture24 - Magnetic Induction(chapter 31 Magnetic...

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