Ch19_Part1

Ch19_Part1 - Chapter 19, part 1 PHY213 Magnets Chapter 19...

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Chapter 19, part 1 PHY213 1 Chapter 19 Magnetism Magnets s Poles of a magnet are the ends where objects are most strongly attracted s Two poles, called north and south s Like poles repel each other and unlike poles attract each other s Similar to electric charges s Magnetic poles cannot be isolated s If a permanent magnetic is cut in half repeatedly, you will still have a north and a south pole s This differs from electric charges s There is some theoretical basis for monopoles, but none have been detected More About Magnetism s An unmagnetized piece of iron can be magnetized by stroking it with a magnet s Somewhat like stroking an object to charge an object s Magnetism can be induced s If a piece of iron, for example, is placed near a strong permanent magnet, it will become magnetized Types of Magnetic Materials s Soft magnetic materials, such as iron, are easily magnetized s They also tend to lose their magnetism easily s Hard magnetic materials, such as cobalt and nickel, are difficult to magnetize s They tend to retain their magnetism
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PHY213 2 Sources of Magnetic Fields s The region of space surrounding a moving charge includes a magnetic field s The charge will also be surrounded by an electric field s A magnetic field surrounds a properly magnetized magnetic material Magnetic Fields s A vector quantity s Symbolized by s Direction is given by the direction a north pole of a compass needle points in that location s Magnetic field lines can be used to show how the field lines, as traced out by a compass, would look B r Magnetic Field Lines, sketch s A compass can be used to show the direction of the magnetic field lines (a) s A sketch of the magnetic field lines (b) Magnetic Field Lines, Bar Magnet s Iron filings are
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This note was uploaded on 08/25/2009 for the course PHY 213 taught by Professor Cao during the Summer '08 term at Kentucky.

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Ch19_Part1 - Chapter 19, part 1 PHY213 Magnets Chapter 19...

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