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AP Physics Chapter 21 Electromagnetic Induction, Faraday’s Law, and AC Circuits

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.

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AP Physics Chapter 21 Electromagnetic Induction, Faraday’s Law, and AC Circuits

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  1. AP Physics Chapter 21Electromagnetic 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.

  2. 21-2 Induced EMF • Michael Faraday (1791-1867) Faraday found that an induced emf is produced by a changing magnetic field. • See diagram on p623 • A constant B induces no emf.

  3. 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 fB. • fB=BA=BAcosq • E=-N fB=BA=BAcosq • Lenz’s law …an induced emf always gives rise to a current whose magnetic field opposes the original change in flux. • See Examples 21-2-21-3 p626-627

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

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