Author: Sune Fischer
Date: 00:53:47 02/02/03
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On February 01, 2003 at 21:43:53, Ratko V Tomic wrote: >>You don't have to worry much about magnetic fields, if the computer components >>are incased in metal that stops the field, it's called a Faraday cage (it's for >>the same reason a car will protect you from lightning). > >The Faraday cage protects inside the (metal) enclosed space, >not outside. A moving charge inside a metal cage easily produces >variable EM fields outside the cage. Are you sure? I think there is symmetry here, if you take a metal wall you can't radio transmit from one side of the wall to the other (assuming the wall is a full hyperplane). IIRC it can be derived from Maxwell's, but I have to admit I'm too rusty so I'm just speaking from memory. "A conducting cage used to shield electronic equipment. Amazingly, the law of electrostatics conspire so that electric fields outside are completely canceled out in the interior, as well as vice versa. " http://scienceworld.wolfram.com/physics/FaradayCage.html I would have thought this is also the reason the space shuttle can't have radio communication when entering the atmosphere, that the ionization surrounding it acts like a Faraday cage. -S.
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