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lect17_handout - Physics 202, Lecture 17 Todays Topics...

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Physics 202, Lecture 17 Today’s Topics Inductance (Ch 32) Reminder of Faraday’s and Lenz’s Laws Self Inductance Mutual Inductance Energy Stored in B Field RL Circuits Review: Faraday’s Law of Induction Faraday’s Law in plain words: When the magnetic flux through an area is changed, an emf is produced along the closed path enclosing the area. Quantitatively: A B θ conventional direction of ε Note the - sign Review: Lenz’s Law Lenz’s law in plain words: the induced emf always tends to work against the original cause of flux change Cause of d Φ B /dt “Current” due to Induced ε 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 The magnetic flux due to self inductance is proportional to I : The induced emf is proportional to dI/dt: When the current in a conducting device changes, an induced emf is produced in the opposite direction
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lect17_handout - Physics 202, Lecture 17 Todays Topics...

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