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Transcript
Magnetic Fields A PowerPoint Presentation by Paul E. Tippens, Professor of Physics Southern Polytechnic State University © 2007 Objectives: After completing this module, you should be able to: • Define the magnetic field, discussing magnetic poles Magnetism Since ancient times, certain materials, called magnets, have been known to have the property of attracting tiny pieces of metal. This attractive property is called magnetism. S Bar Magnet S N N Magnetism The domain theory is a simple model of magnetism which states that all materials are made up of tiny regions called domains. The domains behave like magnets. Random distribution=no magnetic effect Domains aligned=magnetized Magnetic Poles Iron filings N The strength of a magnet is concentrated at the ends, called north and south “poles” of the magnet. S A suspended magnet: N-seeking end and S-seeking end are N and S poles. W N S N Bar magnet S N E Compass Magnetic Attraction-Repulsion S S N N N Magnetic Forces: Like Poles Repel S S N N S Unlike Poles Attract Magnetic Field Lines We can describe magnetic field lines by imagining a tiny compass placed at nearby points. The direction of the magnetic field B at any point is the same as the direction indicated by this compass. N S Field B is strong where lines are dense and weak where lines are sparse. Magnetic Field Lines The field lines follow the needle on the compass Field Lines Between Magnets Unlike poles Attraction N S Leave N and enter S N Like poles N Repulsion
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