Magnetism

Magnets What is a magnet? – An item that exhibits magnetism – What is magnetism? A property of matter in which there is a force of attraction or repulsion between unlike or like poles S N N SS N S N

What are magnetic poles? Often referred to as the north and south ends on a magnet Defined as the two ends of a piece of magnetic material where the magnetic forces are strongest – Like magnetic poles repel and opposite magnetic poles attract

Review Which group of transition metals exerts a magnetic field? – Iron Triad - Iron, Cobalt, and Nickel – What is a magnetic field? The region around the magnet where magnetic force act – This sounds very similar to an electric field!!!!!!

How are electricity and magnetism similar? For each, as the distance between the objects decreases, the attraction/repulsion increases or as the distance increases, the attraction/repulsion decreases Greater Attraction or Repulsion Lesser Attraction or Repulsion

Do only the metals in the iron triad posses magnetic properties? Only a few materials show strong magnetic properties – Iron Triad – Items made with these metals are known as permanent magnets However if you bring a magnet near or in contact with specific items (such as paper clips and nails) you can produce a temporary magnet – Why is this?

Magnetic Domain Explains the grouping of atoms in an object Defined as groups of atoms with aligned magnetic poles The domains are randomly arranged in an unmagnetized object In a magnetized object, the domains are aligned

Can permanent magnets lose their magnetism? Yes, but not all of there magnetic properties – If the permanent magnet is dropped or heated the atoms will somewhat realign themselves due to jostling or particle acceleration