Re: Lightning Strikes Observatory

Greg Neill wrote:
"Sam Wormley" <swormley1@xxxxxxxxx> wrote in message news:rdKDg.89097$FQ1.65754@xxxxxxxxxxxx

Chris L Peterson wrote:

On Sun, 13 Aug 2006 16:58:41 GMT, Sam Wormley <swormley1@xxxxxxxxx>
wrote:


Faraday Cage http://scienceworld.wolfram.com/physics/FaradayCage.html

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.

No help for the magnetic field, though.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

I think all electromagnetic radiation. However, most structures are
not even close to Faraday cages at the wavelength associated with
lightning.


Suggested Experiment:

Wrap a magnet tightly in a ball of aluminum foil so
that it is in effect contained in a Faraday cage.
Will it still attract ferromagnetic materials outside the foil?

For a static DC field a Faraday cage works.
Conductive non ferromagnetic materials will transmit a static magnetic field.

The moment you have microsecond rise time currents then you have eddy currents, skin and other propagation effects that can change all that.

That's why you can play magnetic ring toss with a copper loop.

You are right wanting a high permeability material for shielding.

d.

.

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