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Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
Inside A Magnet
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Inside A Magnet

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  • 1. Inside a Magnet
  • 2. Domain Theory <ul><li>Atoms point in random directions in most materials therefore canceling out each others magnetic fields </li></ul><ul><li>If magnetic fields in a group of atoms are aligned with one another they create a magnetic domain. </li></ul>
  • 3. Alignment of Domains <ul><li>When many or all domains are pointing the same direction, the material becomes magnetized. </li></ul>
  • 4. Magnetic Materials <ul><li>Ferromagnetic Materials- materials that show strong magnetic properties (its magnetic domains are aligned) </li></ul><ul><ul><li>Examples in nature: iron, nickel, cobalt, and gadolinium </li></ul></ul>
  • 5. <ul><li>Alloy magnets- made from several different materials </li></ul><ul><ul><li>Alnico ( Al uminum, ni ckel, i ron, co balt) </li></ul></ul><ul><li>Ferrite magnets- mixture of substances that contain ferromagnetic elements </li></ul><ul><ul><li>Stronger and less expensive than </li></ul></ul><ul><ul><li>metal magnets </li></ul></ul>
  • 6. Making and Changing Magnets <ul><li>2 ways to make magnets </li></ul><ul><ul><li>Place unmagnetized ferromagnetic material in the presence of a strong magnetic field </li></ul></ul><ul><ul><li>Rubbing ferromagnetic materials with one pole of a magnet </li></ul></ul>
  • 7. <ul><li>Temporary magnet- </li></ul><ul><ul><li>easy to magnetize, but easily loses its magnetism </li></ul></ul><ul><li>Permanent magnet- </li></ul><ul><ul><li>hard to magnetize, but keeps its magnetism for a long period of time </li></ul></ul>
  • 8. 2 Ways to destroy a magnet <ul><li>Drop or strike a magnet hard </li></ul><ul><li>Heat a magnet </li></ul>
  • 9. Breaking Magnets
  • 10. Breaking magnets <ul><li>When you break a magnet, you end up with two smaller magnets </li></ul><ul><ul><li>Due to domains all being aligned, the more times you break a magnet, the more mini magnets you end up with. </li></ul></ul>

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