Monday, April 15, 2013

Magnetism

In this video Bill Nye explains how magnets work and why it is so. He uses the example of the earth as a giant magnet and explains what happens when you cut a magnet in half. A magnet has two poles, a north and a south. When a magnet it cut in half there is still a north and south pole on each half of the magnet. Like poles repel and unlike poles attract. When looking at electromagnetic fields, the field lines align when the south pole of a magnet across from a north pole of a magnet. Magnets are made of cobalt, nickel, and iron. Since the earth's core consists of this, the earth is a giant magnet.

1 comment:

  1. I was going to use this video as well!! I also liked how this video explained what happens to a magnet when it is cut in half. I know what an electromagnetic field but I think it is important to mention that this field is generated by a magnet. The field lines move from the south pole to the north pole and back around again. I really liked how the video also talks about the earth as a giant magnet!!

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