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It is a fact taken from observation of nature that any object that carries charge and moves with a nonzero acceleration radiates EM waves. Of course, the properties of the radiated EM waves strongly depend on HOW the source moved, what it's acceleration was. As a simple example, let's consider your comb, after you combed your hair. The comb is made of plastic, and it becomes charged after you brush your hair (your hair, of course, becomes charged with the equal, but opposite, charge). If one starts to wave the comb up and down, the charge on the comb moves with a nonzero acceleration, and therefore shines EM waves.
It should be emphasized that a charged object has to have a nonzero acceleration to be able to radiate. Steadily moving objects DO NOT radiate. On the next page I describe the propagation of EM waves. |
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last modified 1/5/2001 email Fermilab |
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