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Magnetism

Magnetism. Magnets. What is a magnet? An item that exhibits magnetism What is magnetism? A property of matter in which there is a force of attraction or repulsion between unlike or like poles. N. S. S N. S N.

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Magnetism

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  1. Magnetism

  2. Magnets • What is a magnet? • An item that exhibits magnetism • What is magnetism? • A property of matter in which there is a force of attraction or repulsion between unlike or like poles N S S N S N N S

  3. What are magnetic poles? • Often referred to as the north and south ends on a magnet • Defined as the two ends of a piece of magnetic material where the magnetic forces are strongest • Like magnetic poles repel and opposite magnetic poles attract

  4. Review • Which group of transition metals exerts a magnetic field? • Iron Triad - Iron, Cobalt, and Nickel • What is a magnetic field? • The region around the magnet where magnetic force act • This sounds very similar to an electric field!!!!!!

  5. How are electricity and magnetism similar? • For each, as the distance between the objects decreases, the attraction/repulsion increases or as the distance increases, the attraction/repulsion decreases Greater Attraction or Repulsion Lesser Attraction or Repulsion

  6. Do only the metals in the iron triad posses magnetic properties? • Only a few materials show strong magnetic properties – Iron Triad • Items made with these metals are known as permanent magnets • However if you bring a magnet near or in contact with specific items (such as paper clips and nails) you can produce a temporary magnet • Why is this?

  7. Magnetic Domain • Explains the grouping of atoms in an object • Defined as groups of atoms with aligned magnetic poles The domains are randomly arranged in an unmagnetized object In a magnetized object, the domains are aligned

  8. Can permanent magnets lose their magnetism? • Yes, but not all of there magnetic properties • If the permanent magnet is dropped or heated the atoms will somewhat realign themselves due to jostling or particle acceleration

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