Electromagnetism is the force involving the interaction of electricity and magnetism. It is the science of electrical charge, and its rules govern the way charged particles of atoms interact. Electromagnetism is one of the four fundamental forces of the universe (gravity and the "strong" and "weak" forces that hold an atomic nucleus together are the other three). Because its effects can be observed so easily, electromagnetism is the best understood of these four forces.
Modern scientists know that radio and television waves, microwaves, infrared rays, ultraviolet light, visible light, gamma rays, and X rays are all electromagnetic waves that travel through space independent of matter. And they all travel at roughly the same speed—the speed of light—differing from each other only in the frequency at which their electric and magnetic fields oscillate.
Many common events depend upon the broad span of the electromagnetic spectrum. The ability to communicate across long distances despite intervening obstacles, such as the walls of buildings, is possible using the radio and television frequencies. X rays can see into the human body without opening it. These things, which would once have been labeled magic, are now ordinary ways we use the electromagnetic spectrum.
The unification of electricity and magnetism has led to a deeper understanding of physical science, and much effort has been put into further unifying the four forces of nature. Scientists have demonstrated that the weak force and electromagnetism are part of the same fundamental force, which they call the electroweak force. There are proposals to include the strong force in a grand unified theory, which attempts to show how the four forces can be thought of as a manifestation of a single basic force that broke apart when the universe cooled after the big bang (theory that explains the beginning of the universe as a tremendous explosion from a single point that occurred 12 to 15 billion years ago). The inclusion of gravity in the unified theory, however, remains an open problem for scientists.
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http://www.scienceclarified.com/El-Ex/Electromagnetism.html#ixzz3HKVX2TXAhttp://en.wikipedia.org/wiki/Electromagnetismhttp://www.britannica.com/EBchecked/topic/183324/electromagnetismYou're welcome...
Topic: Electromagnetism (Read 11093 times)
