Mag. Induction

# Mag. Induction - PHY 2049C General Physics B Fields...

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PHY 2049C – General Physics B Fields, Circuits, Waves, Light Today: 1) Inductance 2) RL Circuits

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Intro: Induced Voltage Michael Faraday: ”If current produces a magnetic field, why can't a magnetic field produce a current ?” When switch is opened, magnetic field in magnet core reduces, Galvanometer shows negative current through coil Y When switch is closed, positive current. Apparently, a changing magnetic Field produces V
Intro: Induced Voltage 2 Inserting a magnet into a coil also produces an induced voltage or current. The faster speed of insertion/ retraction, the higher the induced voltage. What we change here is called the “magnetic flux” , the amount of field B through an area A : cos M Bd A B A θ Φ= = G G

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Faraday's Law of Induction The induced Voltage (emf ε ) over a coil is “winding number” N times the change of the magnetic flux Φ through the coil per time ; The magnetic flux is defined as the magnetic Field passing through a loop of area A The angle θ is measured between the normal direction of the area and the magnetic field direction M induced d VN dt Φ =− cos M Bd A B A θ Φ= = G G

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## This note was uploaded on 06/29/2010 for the course PHY2049C PHY2049C taught by Professor Duke during the Summer '10 term at FSU.

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Mag. Induction - PHY 2049C General Physics B Fields...

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