Magnetism Source

http://www.youtube.com/watch?v=ak8Bh9Zka50

            This source was particularly useful in explaining the basics of magnets. I liked how it explained that the Earth has a magnetic field and that all magnets have a north and south pole no matter what. One interesting part of the video was when the boy was pretending to take away the paper clips with magic when really he was using a magnet to pull the paper clips away. A paper clip is not always magnetized. Domains in a paper clip are random [domain is a cluster of electrons that are spinning in the same direction]. All magnets have a magnetic field. When the magnet is close to the paper clip, the domains of the paper clip align to match the magnetic field of the magnet. The paper clip now has a north pole and a south pole and the north pole of the paperclip is attracted to the south pole of the magnet and thus the paper clip sticks to the magnet.