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Magnetism

Magnetism. I. Magnets: Natural and Artificial. Ferromagnetic – naturally magnetic Examples:. Iron ( F e). Steel (alloy). Cobalt (Co). Nickel (Ni). Dysprosium ( Dy ). Gadolinium ( Gd ). Ferromagnetic substances can lose their natural magnetism if heated at a specific temperature.

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Magnetism

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  1. Magnetism

  2. I. Magnets: Natural and Artificial Ferromagnetic – naturally magnetic Examples:

  3. Iron (Fe)

  4. Steel (alloy)

  5. Cobalt (Co)

  6. Nickel (Ni)

  7. Dysprosium (Dy)

  8. Gadolinium (Gd)

  9. Ferromagnetic substances can lose their natural magnetism if heated at a specific temperature.

  10. Artificial Magnets • Can be made from ferromagnetic substances • Alnico magnets are made with aluminum, nickel and cobalt

  11. Horseshoe Magnet

  12. Bar Magnets

  13. Rod Magnets

  14. Permanent Magnets • Hold on to their magnetism • High retention • Hard Magnets

  15. Temporary Magnets • Low Retention • Tend to lose magnetism easily • Soft magnets • Example: Iron-Silicon alloys

  16. Making Magnets • You can make a temporary magnet by placing a ferromagnetic material in a magnetic field. • You can stroke a ferromagnetic material (like a nail) with a permanent magnet in one direction. This aligns all the north and south seeking poles in opposite directions.

  17. Credit Cards have magnetic strips • Being in contact with a magnetic field will erase the information by realigning/reversing the iron particles. Common demagnetizers include: • pads used to deactivate security devices in new books, CDs, and movies • some security screening machines • Small magnets like those used on the refridgerator • Speakers • Some cell phones, • Magnetic clasps on wallets and purses

  18. A magnet can destroy a hard drive • Magnet on a laptop

  19. A magnet can lose its magnetism By: • Dropping it • Heating it • Striking it

  20. Keeping Magnets strong • Placing a Keeper across the poles when not in use.

  21. Storing magnets in pairs with opposite poles together • Keeping the magnet on a metal like attached to a filing cabinet

  22. II. The Law of Magnetic Attraction

  23. III. Magnetic Field

  24. IV. The Force and Nature of Magnetism

  25. V. The Earth Behaves as a Magnet

  26. VI. Uses of Magnets and Magnetism

  27. VII. Magnetism Can Be Obtained From Electricity

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