Monday, September 20, 2010

Magnetism and Electromagnetism

- A magnetic field is the distribution of magnetic force in the region of a magnet.

- North and South are the two different magnetic characteristics. They are responsible for magnetic force.

- Similar magnetic poles (i.e. north and north, or south and south) repel one another.

- Dissimilar poles (north and south) attract one another with a force at a distance.

- To map a magnetic field we need to use a test compass.

-The Earth acts like a giant magnet, producing its own magnetic field. It is suggested that this magnetic field is produced because of the flow of hot liquid metals inside Earth.

- Magnetic forces act on ferromagnetic objects (certain metals that are not magnets.) Some ferromagnetic metals are iron, nickel, and cobalt. They have atomic structures that make them strongly magnetic.

-Domain Theory:
All large magnets are made up of many smaller, and rotatable magnets, called dipoles, which can interact with other dipoles close by. If the dipoles line up, then a small magnetic domain is produced.

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