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Unformatted text preview: 1 Physics 202, Lecture 16 Todays Topics Faradays Law (Ch 31) Review Lenzs Law Faradays Law Explained Example: Electric Generator Motional Emf Expected Preview: Ch 31 Faradays Law of Induction The emf induced in a circuit is proportional to the time rate of change of magnetic flux through the circuit. d d B = B nominal direction of Notes: Circuit: any closed path does not have to be real conducting circuit The path/circuit does not have to be circular, or even planar dt A = A B d B Review: Lenzs Law Lenzs law in plain words: the induced emf always tends to work against the original cause of flux change Cause of d B /dt Current due to Induced will: Increasing B generate B in opposite dir. Decreasing B generate B in same dir. Relative motion subject to a force in opposite direction of relative motions Note: Current may not actually produced if no circuit) Examples of Lenzs Law 2...
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This note was uploaded on 04/25/2009 for the course PHYS 202 taught by Professor Everett during the Spring '08 term at Wisconsin.
- Spring '08