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How does a television set use an electromagnet?

Please tell me the answer in a 4+ sentence paragraph. I seriously need this answer because I need to know how a television uses an electromagnet.

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1. In a TV using a cathode ray tube (i.e. not a flat screen TV), the electromagnets scan the electron beam across the screen to create the image line by line. As the beam hits the different red, green and blue pixels an image is formed. This works because the electrons in the electron beam are repulsed by the magnetic field generated by the electromagnets, which is varied electronically to scan the beam across the screen. The electromagnets scan the beam fast enough to cover the entire screen around 50-60 times every second.