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MAGNETISM

MAGNETISM. HISTORY. More than 2000 years ago – Greeks discovered a rock that was attracted to materials that contained iron. MAGNETITE was this rock. FIRST USE. LODESTONE – made from magnetite (Fe3O4) Used to make a compass used by ancient Greek & Chinese. MAGNETISM.

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MAGNETISM

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  1. MAGNETISM

  2. HISTORY • More than 2000 years ago – Greeks discovered a rock that was attracted to materials that contained iron. • MAGNETITE was this rock

  3. FIRST USE • LODESTONE – made from magnetite (Fe3O4) • Used to make a compass used by ancient Greek & Chinese

  4. MAGNETISM • The ability of a substance to attract iron • Magnets have magnetic poles. • There are two poles: • North Seeking Pole (NORTH) • South Seeking Pole (SOUTH)

  5. EARTH IS A MAGNET!

  6. MAGNETIC FIELD • The region around a magnet where the magnetic force acts & is composed of lines of force.

  7. POLE INTERACTIONS • Opposite poles = force of attraction • Like poles = force of repulsion • What does that look like?

  8. FORCE OF ATTRACTION

  9. CAN YOU SEE THE LINES OF FORCE?

  10. FORCE OF REPULSION

  11. REPULSION = PUSHES AWAY

  12. ATTRACT AND REPEL! ATTRACT! REPEL!

  13. SUMMARY

  14. EVERYDAY USES OF MAGNETS

  15. MORE USES

  16. MORE USES! This is a MRI machine. MRI stands for: Magnetic Resonance Imaging

  17. More USES!

  18. Types of Magnets • Temporary – made by induction, magnetism that only occurs in the presence of a magnetic field • Permanent – simply b/c some materials are SO influenced by magnetic fields, they become magnets themselves (Fe, Ni, Co)

  19. MAGNETIC DOMAINS Alignment of particles in the material can determine whether it will be magnetic or not.

  20. MAGNETIZING A NAIL(INDUCTION)

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