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Transcript of Magnetism
"HowStuffWorks "How Compasses Work"" Howstuffworks "Adventure" Web. 28 Apr. 2010. <http://adventure.howstuffworks.com/outdoor-activities/hiking/compass.htm>.
"HowStuffWorks "How Electric Motors Work"" Howstuffworks "Electronics" Web. 28 Apr. 2010. <http://electronics.howstuffworks.com/motor1.htm>.
"HowStuffWorks "How Speakers Work"" Howstuffworks "Electronics" Web. 29 Apr. 2010. <http://electronics.howstuffworks.com/speaker6.htm>.
"Magnetic Therapy." Vanderbilt University | Nashville, Tennessee. Web. 29 Apr. 2010. <http://www.vanderbilt.edu/AnS/psychology/health_psychology/magnet_therapy.html>. Opposites attract and likes repel. So if you have two bar magnets with their ends marked "north" and "south," then the north end of one magnet will attract the south end of the other. On the other hand, the north end of one magnet will repel the north end of the other (and similarly, south will repel south). Inside an electric motor, these attracting and repelling forces create rotational motion. Thus causeing the motor to generate electricity. When the electrical current flowing through the voice coil changes direction, the coil's polar orientation reverses. This changes the magnetic forces between the voice coil and the permanent magnet, moving the coil and attached diaphragm back and forth.