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Phys 0175 - Lecture 26

Phys 0175 - Lecture 26 - Lecture 26(Mar 20 2009 Induction...

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Lecture 26 (Mar. 20, 2009): Induction and Inductance (Chapter 30): Two experiments that demonstrate induction Faraday’s Law of Induction Definition of magnetic flux Lenz’s Law Illustrative examples Induction and energy transfers Eddy currents
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Induction … is the answer to the question: what does an electric guitar have in common with the cruise control device in a car and with an electric generator at a power station? Two experiments that demonstrate induction: A B
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Summary of observations for experiment A: A current appears only if there is relative motion between the loop and the magnet The faster the motion, the greater the current The direction of the current reverses if the direction of the relative motion is reversed The direction of current also reverses if S pole rather than N pole approaches/recedes.
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Summary of observations for experiment B: An induced current appears only if the current in the energized coil is changing. The faster the current in the energized coil changes, the greater the induced current The direction of the induced current reverses if the current in the energized coil decreases rather than increases The magnitude of the induced current depends on the proximity as well as the orientation of the two coils to each other.
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