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Magnetism

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Magnetism Magnetic Poles Magnetic ... these are the areas where magnetic effect is the strongest Always appear in pairs Like Poles = Repulsion Different ... – PowerPoint PPT presentation

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Title: Magnetism


1
Magnetism
Created By Mr. Mossey
2
Magnetism
  • Force of attraction or repulsion of a magnetic
    material due to the arrangement of its atoms
  • Dependant on atomic structure

3
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
4
Magnetic Field
  • Region in which magnetic forces act
  • Can be represented with lines
  • Forms complete loops from north to south poles

5
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

6
Magnetic Domain
  • Groups of atoms with electrons that align
    themselves in one direction
  • This results in regions of grouped magnetic
    fields

7
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

8
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

9
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

10
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)
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