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Lecture%2023%202220%20Spring%202009 - Reminders and...

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1 Reminders and Announcements Homework 14 is due tomorrow; HW 15 is due Friday Exam 2 is next Monday Help Room Hours (Physics 117): M 4-8 pm, T 3-6:30, W 3-6:30, R 4:30-8, F 2-6 Chapter 31 Faraday’s Law Michael Faraday Great experimental physicist 1791 1867 Contributions to early electricity include: Invention of motor, generator, and transformer Electromagnetic induction Laws of electrolysis Induction An induced current is produced by a changing magnetic field There is an induced emf associated with the induced current A current can be produced without a battery present in the circuit Faraday’s law of induction describes the induced emf Faraday’s Law – Statements Faraday’s law of induction states that “the emf induced in a circuit is directly proportional to the time rate of change of the magnetic flux through the circuit” Mathematically, B d ε dt Faraday’s Law – Statements, cont Remember B is the magnetic flux through
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