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Lecture24

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1 Lecture 24 Chapter 23. Faraday’s Law ‘Magnetic force’ approach: B v q E q F tot × + = = vB E L vB emf = I Use Faraday law: dt d emf mag Φ = A B mag Δ = ΔΦ t Lv B Δ = L vB t emf mag t Δ = Δ ΔΦ = 0 lim I Faraday’s Law and Motional EMF B 1 B 2 v L R dt d emf mag Φ = I Example 4/17/11 4 Eddy Currents *Relative motion between a B field and a conductor induces a current in the conductor. *The induced current give rises to a net magnetic force, F M , which opposes the motion.

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2 4/17/11 5 Demonstration 6D-07 4/17/11 6 Eddy Currents 4/17/11 7 Demonstration: Eddy Currents 6D-08 4/17/11 8 Eddy Currents B field into the page v v Induced current anti-clockwise Induced current clockwise Flux increasing Flux decreasing F F x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x During the last lecture we considered currents confined to a loop or a coil. Electrical equipment contains other metal part which are often located in changing B fields. Currents in such parts are called Eddy currents
3 4/17/11 9 Reduce Eddy Currents Metal strips with insulating glue

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