Tuesday, September 21, 2010

Blog 6.0 Note: Introduction to Magnetism



Picture: Visible magnetic fields from the help of iron filings

magnetic field - a physical field produced by a magnetic object

North/South - labels for two different magnetic characteristics that create the magnetic forces.




The law of magnetic forces:
  • Opposites attract
  • Similar repel
test compass - helps find a magnetic field (sorta like test charge in electrostatics)

ferromagnetic metals - a metal with different elements mixed together (e.g. iron, nickel, and cobalt). Has an atomic structure which makes them strongly magnetic.

domain theory of magnets - 'smaller magnets' that make up magnetic objects



Picture: The direction of the dipoles are based on being magnetized by another magnet


Domain theory - all large magnets are made up of small, rotatable magnets = dipoles
if the dipoles line up, then a small magnetic domain is produced.






LOLWAT: the North pole is actually 'south', since the North points in the direction of the North pole.

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