Magnetism. The Nature of Magnets ► ► Magnetism: force of attraction or repulsion Attraction to...
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Transcript of Magnetism. The Nature of Magnets ► ► Magnetism: force of attraction or repulsion Attraction to...
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Magnetism
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The Nature of Magnets
►Magnetism: force of attraction or repulsion Attraction to any substance that is, or can
become, a magnet►Rule of magnets:
Opposite poles attract Like poles repel
►Magnetic fields: area surrounding the magnet that influences other objects
►Poles: region of magnet where effects of magnet are strongest
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A single magnet
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Two magnets
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►Magnetic domains: groups of atoms lined up together unmagnetized: groups are in random
patterns magnetized: atoms all (or mostly) line up
in one direction►Magnets made of iron, cobalt, nickel
Called ferromagnetic (“ferro-” for Fe or iron-like)
Atoms can rearrange to line up in these materials
What causes magnetism?
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Domains
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The Earth as a magnet
►Demonstration of magnet and “lodestone”
►compass always points to North►Why?►The earth itself is a magnet
strongest force is at the poles of the magnet (The North and South Pole!)
Inner core of molten iron and nickel spinning
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►Poles switch about every 500,000 years evidence in rock
samples
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The Sun’s Effect on Earth
►Solar wind: charged particles from the sun would destroy us if earth had no magnetic field
►Cause interference for TV, Cell phones
►Auroras: Northern and Southern Lights charged particles hit a
tmosphere at the Poles and cause the air to glow Video of AurorasAuroras in Finland
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►Brainpop on magnetism►DVD on magnetism