Lec18-1-LPN

Lec18-1-LPN - cture 18- cture 18- 1 Faraday’s Law of...

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Unformatted text preview: cture 18- cture 18- 1 Faraday’s Law of Induction The magnitude of the induced EMF in conducting loop is equal to the rate at which the magnetic flux through the surface spanned by the loop changes with time. Minus sign indicates the sense of EMF: Lenz’s Law • Decide on which way n goes Fixes sign of ϕ B • RHR determines the positive direction for EMF N N cture 18- cture 18- 2 Motional EMF of Sliding Conductor Lenz’s Law gives direction Induced EMF: counter-clockwise Faraday’s Law This EMF induces current I Magnetic force F M acts on this I F M decelerates the bar cture 18- cture 18- 3 Ways to Change Magnetic Flux • Changing the magnitude of the field within a conducting loop (or coil). • Changing the area of the loop (or coil) that lies within the magnetic field. • Changing the relative orientation of the field and the loop . motor generator cos B BA θ Φ = http://www.wvic.com/how-gen-works.htm cture 18- cture 18- 4 Other Examples of Induction Switch has been open for some time:...
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This note was uploaded on 12/07/2011 for the course PHYS 241 taught by Professor Wei during the Fall '08 term at Purdue.

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Lec18-1-LPN - cture 18- cture 18- 1 Faraday’s Law of...

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