lecture 19 - Chapter 19 Magnetism Magnets Poles of a magnet...

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    Chapter 19 Magnetism
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    Magnets Poles  of a magnet are the ends where objects  are most strongly attracted Two poles, called  north  and  south Like poles repel each other and unlike poles  attract each other Similar to electric charges Magnetic poles cannot be isolated If a permanent magnetic is cut in half repeatedly, you will still  have a north and a south pole This differs from electric charges There is some theoretical basis for monopoles, but none  have been detected
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    More About Magnetism An unmagnetized piece of iron can be  magnetized by stroking it with a magnet Somewhat like stroking an object to charge  an object Magnetism can be induced If a piece of iron, for example, is placed  near a strong permanent magnet, it will  become magnetized
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    Types of Magnetic Materials Soft magnetic  materials, such as iron,  are easily magnetized They also tend to lose their magnetism  easily Hard magnetic  materials, such as cobalt  and nickel, are difficult to magnetize They tend to retain their magnetism
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    Sources of Magnetic Fields The region of space surrounding a  moving  charge includes a magnetic field The charge will also be surrounded by an  electric field A magnetic field surrounds a properly  magnetized magnetic material
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    Magnetic Fields A vector quantity Symbolized by  Direction is given by the direction a  north pole  of a compass needle points  in that location Magnetic field lines  can be used to  show how the field lines, as traced out  by a compass, would look B r
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    Magnetic Field Lines, sketch A compass can be used to show the direction  of the magnetic field lines (a) A sketch of the magnetic field lines (b)
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    Magnetic Field Lines, Bar  Magnet Iron filings are used  to show the pattern  of the magnetic field  lines The direction of the  field is the direction  a north pole would  point
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    Magnetic Field Lines, Unlike  Poles Iron filings are used to  show the pattern of the  magnetic field lines The direction of the field is  the direction a north pole  would point Compare to the magnetic  field produced by an electric  dipole
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    Magnetic Field Lines, Like  Poles Iron filings are used to  show the pattern of the  electric field lines The direction of the field  is the direction a north  pole would point Compare to the electric  field produced by like  charges
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  Earth’s Magnetic Field The Earth’s geographic north pole  corresponds to a magnetic south pole The Earth’s geographic south pole 
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This note was uploaded on 09/06/2009 for the course PHYSICS Physics 2A taught by Professor Sydney.sukuta during the Fall '09 term at San Jose City College.

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lecture 19 - Chapter 19 Magnetism Magnets Poles of a magnet...

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