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Lecture26

# Lecture26 - Physics 132 Introductory Physics Electricity...

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1 March 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 1 Physics 132 Introductory Physics: Electricity and Magnetism Winter Quarter 2008 Lecture 26 March 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 2 Electromagnetism and Maxwell’s Equations Closed Surfaces Closed Loops E d A = Q enc ε 0 Gauss’ Law B d A = 0 No magnetic monopoles E d s = d φ B dt Faraday’s Law of Induction B d s = μ 0 I enc + μ 0 ε 0 d φ E dt Ampere’s Law (w/ Maxwell Term) The four basic equations that govern electric and magnetic fields. Gauss’ Law: Electric charges create electric fields. Ampere’s Law: Moving electric charges (currents) create magnetic fields. Faraday’s Law: Changing magnetic fields create electric fields. Maxwell’s Term: Changing electric fields create magnetic fields.

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2 March 7, 2008 Physics 132-Winter 2008 Prof. Jim Beatty-Ohio State 3 Coil 1 Transformers & Mutual Inductance R Coil 2 i B Time-dependent current in Coil 1 creates a varying magnetic field B.
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