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Unformatted text preview: 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 Gauss’ Law B • d A ∫ = No magnetic monopoles E • d s = − d φ B dt ∫ Faraday’s Law of Induction B • d s = μ I enc + μ ε 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. 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...
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- Winter '08
- Magnetism, Magnetic Field, Prof. Jim Beatty-Ohio, Jim Beatty-Ohio State