Author: Sune Fischer
Date: 01:42:18 02/02/03
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On February 02, 2003 at 03:53:47, Sune Fischer wrote: Okay, I thought some more about it, and you must be right, because it's possible to give the cage an electrostatic charge, alterations here will produce a variable EM field. qed. The whole box will be an emitter in fact, hmm :) -S. >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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