Magnetism

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Magnetism
Created By Mr. Mossey
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Magnetism

• Force of attraction or repulsion of a magnetic
  material due to the arrangement of its atoms

• Dependant on atomic structure

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Magnetic Poles

• Either north or south, these are the areas where
  magnetic effect is the strongest

• Always appear in pairs

Like Poles Repulsion Different Poles
Attraction
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Magnetic Field

• Region in which magnetic forces act
• Can be represented with lines

• Forms complete loops from north to south poles

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Magnets

• Permanent Magnets
• Do not lose charge easily
• Can be made of
• nickel cobalt

• Temporary Magnets
• Lose charge easily
• Can be made
  of soft iron

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Magnetic Domain

• Groups of atoms with electrons that align
  themselves in one direction
• This results in regions of grouped magnetic
  fields

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Magnetic Domain

• Each group is a magnetic domain (group of atoms
  with aligned electrons).
• Cancel each other out

• Subjected to a field all the magnetic domains
  line up creating a magnet
• Additive

• Note You can even destroy a permanent magnet
  by forceful rearrangement of the magnetic domains

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Earth Magnet

• William Gilbert first to propose Earth as a
  magnet

• Earth exerts a magnetic force and is surrounded
  by a magnetic field.

• Earth poles do reverse as told by hardened
  molten rock

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Compasses

• North pole of a compass must point to magnetic
  south pole
• Results in north pole being next to magnetic
  south pole

• Magnetic Variation is the difference between
  geographic and magnetic poles
• Weakest at the equator

• Jupiter, Saturn, and the Sun also produce
  magnetic fields

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Solar Wind

• Charged particles sent out by the sun

Magnetosphere

• Region of Earths magnetic field
• Blocks solar wind from damaging Earth

Van Allen Radiation

• Charged particles that penetrate the
  magnetosphere and cycle between the poles
• When close to the atmosphere they cause the air
  to glow (Aurora)