• Notes
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Lecture 06: Faraday’s Law (Knight: 33.5 to 33.7) B x . F F θ θ μ B U - = μ B × = μ τ AI = μ

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Physics 113 Dr. Renat Letfullin 2 Today.. . Faraday’s Law in the terms of Flux Examples: Electromagnetic Induction in a Circular Loop Electromagnetic Induction in a Solenoid Movie: Electromagnetic Induction
Physics 113 Dr. Renat Letfullin 3 Lentz’s Law (1) Heinrich Friedrich Emil Lenz (1804-1865) In 1834, Heinrich Lenz announced a rule for determining the direction of an induced current, which has come to be known as Lenz’s Law. Here is the statement of Lenz’s Law: There is an induced current in a closed conducting loop if and only if the magnetic flux through the loop is changing. The direction of the induced current is such that the induced magnetic field always opposes the change in the flux.

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Physics 113 Dr. Renat Letfullin 4 Faraday’s Law m B dA BA Blx Φ = = = m d d dx Blx Bl dt dt dt Φ = = dx Blv Bl dt = = E m Therefore, d dt Φ = E This is Faraday’s Law .
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