Magnetism - Lecture 02 Chapter 32 F x B F = AI = B U = B...

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Physics 113, Dr. Renat Letfullin 1 Lecture 02: Chapter 32 B x . F F θ θ μ B U - = μ B × = μ τ AI = μ Syllabus is available on-line http://www.rose-hulman.edu/~letfulli
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Physics 113, Dr. Renat Letfullin 2 Today.. . Magnetic Field Source of Magnetic Fields Magnetic Field Lines Magnetic Field Activities S N
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Physics 113, Dr. Renat Letfullin 3 Conclusions from Experiments Concept Magnetism is not the same as electricity. Magnetic poles are similar to charges but have important differences. Magnetism is a long range force . The compass needle responds to the bar magnet from some distance away. Magnets have two poles , north and south. Like poles repel and opposite poles attract. Poles of a magnet can be identified with a compass . A north magnet pole attracts the south-seeking end of the compass needle (which is a south pole). Some materials stick to magnets and others do not. The materials that are attracted are called magnetic materials . Magnetic materials are attracted by either pole of a magnet.
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Physics 113, Dr. Renat Letfullin 4 Compasses and Geomagnetism The north pole of a compass needle is attracted to the geographical north pole of the Earth and repelled by its geographic south pole. Apparently, the Earth is a large magnet, and one with a magnetic south pole near the Earth’s geographic north pole. The reasons for the Earth’s magnetism are complex, involving standing currents in the Earth’s molten interior. The Earth’s magnetic poles are separated somewhat from the geographic poles, and move around some as a function of time. There is evidence in the geological record that the Earth’s field has reversed directions at varying intervals spaced by millions of years. This is not well understood.
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Physics 113, Dr. Renat Letfullin 5 Question : (a)The compass needle rotates clockwise (cw).
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