AP Physics Chapter 21 Electromagnetic Induction, Faraday’s Law, and AC Circuits An electric current produces a magnetic field and a magnetic field exerts.

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Presentation transcript:

AP Physics Chapter 21 Electromagnetic Induction, Faraday’s Law, and AC Circuits An electric current produces a magnetic field and a magnetic field exerts a force on an electric current or moving electric charge.

21-2 Induced EMF Michael Faraday ( ) Faraday found that an induced emf is produced by a changing magnetic field. See diagram on p623 A constant B induces no emf.

21-2 Faraday’s Law of Induction; Lenz’s Law The more rapidly the magnetic field changes, the greater the induced emf. But the emf is proportional to the rate of change of magnetic flux f B. f B =BA=BAcos q E =-N f B =BA=BAcos q Lenz’s law …an induced emf always gives rise to a current whose magnetic field opposes the original change in flux. See Examples p

HOMEWORK P652 Q1-4 Pg 654 PR#1-2 due Friday BOP