-Natural magnets: lodestones
= chunks of iron ore
-Magnets: steel = made
magnetic by stroking
(Iron, Nickel, Cobalt) = attracted to a magnet
except: FeNiCo = e.g.: Cu, Al, wood, glass etc
clusters/groups of molecules in ferromagnetic substances that align themselves when a magnet is present
/ retentivity: the ability to become or to remain magnetized
-Magnetically soft: becomes
magnet easily but does not stay magnetic once magnet is removed
hard: hard to become magnetic but stays magnetic for awhile once magnet is removed
field: area around a magnet where the effects if the magnet can be felt
Gets magnetized when electricity is passed through it (e.g.: solenoid)
type of electromagnet, a coil of wire that becomes magnetic when power is passed through
magnetic North pole(N) and South pole(S)
have two poles; a North and a South pole. They do NOT have a positive (+ve) and a negative (-ve). If they do not have a north
or south pole they are not magnets.
ferromagnetic substances, FeNiCo, have domains that align themselves in the presence of a magnet.
you are given a piece of Iron, Nickel or Cobalt and were able to see the domains inside of the piece you would see a whole
bunch of clusters of molecules in no order. Then if you put the north or south pole of a magnet near that piece of metal you
would notice that all the little domain inside would align themselves. This happens because all those little clusters of molecules
are like little bar magnets. Therefore each cluster has a north and a south pole. So when a magnet is present the opposite
charge would be attracted to the magnet.