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Magnetism. MAGNETISM. Click for more info. 1. magnet. any material that attracts iron. regions in a magnet where magnetic force is strongest (labeled N and S). 2. poles. 3. magnetic force. attractive or repulsive between the poles of magnets like poles repel o pposite poles attract.

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Magnetism1
MAGNETISM

Click for more info

1. magnet

  • any material that attracts iron

  • regions in a magnet where magnetic force is strongest (labeled N and S)

2. poles

3. magnetic

force

  • attractive or repulsive between the poles of magnets

    • like poles repel

    • opposite poles attract


Magnetism2
MAGNETISM

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4. magnetic

field

  • the space around a magnet where its force will affect objects

5. field lines

  • lines showing where the magnetic field is strongest

    • drawn closer together around poles (where the field is strongest)


Magnetism3
MAGNETISM

6. What causes magnetism?

  • electrons in motion

    • Individual electrons spin

    • In most atoms, electrons spin in pairs in opposite directions

    • In iron, there are 4 unpaired electrons


Magnetism4
MAGNETISM

Even the Earth itself acts as a giant magnet thanks to its magnetic core!


Magnetism5
MAGNETISM

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  • small areas in a magnetic substance where atomic magnetic fields line up in the same direction

    • In an unmagnetized object, all the magnetic domains point in different directions

    • Once magnetized, all like magnetic poles line up and point in the same direction

7. magnetic domains


Magnetism6
MAGNETISM

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8. Ferromagnetic

materials

  • easily magnetized, but may not retain its magnetism for long

  • Examples:

    • Iron

    • Nickel

    • Cobalt


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