PHY108 - Chapter 29

PHY108 - Chapter 29 - Ch. 29: Sources of the Magnetic Field...

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Ch. 29: Sources of the Magnetic Field Biot-Savart Law: determines what magnetic field is created by a current distribution Ampere’s Law: simplifies determining B fields from symmetric current distributions. Gauss’ Law for Magnetism. Displacement Current: BEGINNING OF LIGHT! In chapter 28 we learned the expressions for the force due to a magnetic field on a single moving charge and for a current. In this chapter we discuss how magnetic fields are produced by current distributions and the origins of magnetism in materials.
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Chapter 29: Sources of Magnetic Fields o What happens to a compass next to a wire carrying current? Why? o What is the Law of Biot-Savart? How can you use it? o What is Ampere’s law? How can you use it? o Is Ampere’s law the magnetic field equivalent to Gauss’ law ? o Why does Dr. Markelz waste our time with displacement current?
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Oersted’s experiment. What do we notice? Oersted’s experiment. What do we notice? Recall compass points in the direction of magnetic field lines When no current is flowing the compass always point to geographical north. Only the magnetic field due to the earth is present. When current is flowing the compass rotates. It indicates there is a new field near the wire and the field is perpendicular to the wire, thus perpendicular to the current flow. After systematic measurements Jean-Baptiste Biot and Felix Savart
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This note was uploaded on 10/10/2010 for the course PHY 108 taught by Professor Iashvili during the Spring '08 term at SUNY Buffalo.

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PHY108 - Chapter 29 - Ch. 29: Sources of the Magnetic Field...

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