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Published byHomer Marsh Modified over 6 years ago
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Answer the Following Draw the domain of an unmagnetized bar magnet
Draw a magnetic field around a bar magnet Design an experiment which would allow you to see a Magnetic Field What are the two main categories of magnets? What is different about them?
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Breaking a magnet There are two major ways to lose a magnet’s magnetism: Dropping or hitting it hard Heating it up These two things will knock magnetic domains out of alignment Superconductors can keep magnets floating when kept cold enough to function ->
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Magnetic Field Lines Invisible lines that surround EVERY magnet
Magnetic field lines will NEVER cross Field lines always form a complete loop from North to South Closer lines = Stronger Force
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Biggest Magnet Around Earth
Strong magnetic field – so it produces magnets from ferromagnetic materials Explains why there are so many naturally magnetic materials on earth
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Magnetic Declination Our magnetic poles don’t always stay put
Secular Variation is the movement of the magnetic poles over time Magnetic Declination – angle between polar north and south and magnetic north and south Secular Variation is ALWAYS occuring, so magnetic declination’s angle will ALWAYS change
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Evidence of North Pole/South Pole Movement over years
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WHO CARES?
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Earth’s giant magnetic field protects us from the solar storms and solar winds that constantly affect us
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Magnetosphere Solar wind – comes from sun Magnetosphere saves us
High speed particles shooting at earth Magnetosphere saves us Van Allen Belts – regions of protons and electrons moving at high speeds, trapped
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