Phys 0175 - Lecture 23

Phys 0175 - Lecture 23 - Lecture 23 (Mar. 6, 2009): Chapter...

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Lecture 23 (Mar. 6, 2009): Chapter 29: Magnetic Fields due to Currents Show that currents produce magnetic fields The Biot-Savart Law is used to calculate the magnetic field produced by a current Illustrative examples (long straight wire; circular arc; current loop)
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Oersted’s discovery (1819): a current- carrying wire produces a magnetic field zero current current up current down
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Magnetic field lines near a current-carrying wire: Current i B field lines
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Right-Hand Rule for finding Direction of B field:
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General Fact: any moving charge creates a magnetic field 0 2 ˆ 4 ˆ where qv r B r r r r μ π × = = r r r r μ 0 = 4π x 10 -7 T*m/A If the velocity is constant:
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directions with equal speeds v will not only repel each other because of the Coulomb force F E , but they will also repel because of the magnetic force F B between them. Each proton creates a magnetic field that exerts a force on the other proton. The ratio of the
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This note was uploaded on 04/06/2009 for the course PHYS 0175 taught by Professor Koehler during the Spring '08 term at Pittsburgh.

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Phys 0175 - Lecture 23 - Lecture 23 (Mar. 6, 2009): Chapter...

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