23 - Induction II

23 - Induction II - Physics 212 Electromagnetic Induction...

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Physics 212 Fall 2009 Electromagnetic Induction II 10/21/09
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Faraday’s Law An ammeter is connected to a coil of wire. A magnet is sitting motionless next to the wire such that its south end is near the coil and perpendicular to the plane of the coil as shown. The meter indicates that a current is ±owing through the wire from the left toward the right. What, if anything, is wrong with this picture? a) The current should be ±owing from the right toward the left. b) The needle should be slanted toward the right. c) The needle should indicate that there is no current ±owing. d) There is nothing wrong with the picture.
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Summary Faraday’s Law : A changing magnetic fux causes an EMF. Minus sign indicates opposition, N is the number o± turns in the coil Change The magnitude o± B-²eld within the coil. The area o± the coil, or the area o± the coil within the ²eld. The angle between the B-²eld and the plane o± the coil (rotate the coil) Today - Signi²cance o± the negative sign (Lenz’s Law) No need ±or a coil to have an EMF Applications and Examples ε = N d Φ B dt
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This note was uploaded on 10/03/2011 for the course PHYS 212 taught by Professor Tedeschi during the Spring '08 term at South Carolina.

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23 - Induction II - Physics 212 Electromagnetic Induction...

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