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Unformatted text preview: D 22.8 Mutual and Self Induction Lets place two coils side by side. Lets connect one to an AC generator (primary coil) and the other to a voltmeter (secondary coil): The primary coil creates a magnetic field, and some of those field lines pass thru the secondary coil. This produces a change in magnetic flux in the secondary coil, leading to an induced emf! This is called Mutual Inductance . From Faradays Law: , s M s where s is the induced emf in the secondary coil, and Ms is the change in mag. flux thru the secondary coil. The net flux thru the secondary coil is: s s N Where N s is the number of turns in the secondary coil. P I Thus, the flux thru the secondary coil is proportional to the current in the primary. Make this an equality: P s s MI N = P s s I N M = M is a quantity called the Mutual Inductance . We can substitute this into Faradays Law: t N s s  = t N s s  = ) ( t MI P  = ) ( t I M P  = t I M P s  = Now its easy to see that the induced emf in the secondary coil depends on the changing current in the primary coil. Units? [ ] [ ] H Henry A s V So, inductance comes in henries. 1 H is a pretty big inductance. Often use mH or H. Self Inductance Consider just one coil connected to an AC generator: The AC current produces a changing magnetic field which produces a change in mag. flux produces a change in mag....
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 Spring '08
 BLACKMON
 Physics

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