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The walls of the microwave are made of conductive metal, with the viewing hole similar to a mesh wall in a Faraday cage, making a microwave a hybrid Faraday cage. I measured the holes on my microwave and they come out to 1 milimeter; small enough to theoretically block a pulse with a frequency of up to 300 GHz. An electromagnetic pulse would give off energy with a variety of frequencies, but your microwave should block the bulk of them.
Originally posted by Swizzy
That is very interesting indeed! My physics knowledge is only superficial unfortunately
but would it be possible to turn a house into a faraday cage?
Wouldn't that protect most of the electronics in the house?
There is also some question as to how EMP would effect electronic ignitions, as they are already shielded to some degree. Remember, it is the job of the electronic ignition to generate electrical impulses in the 10,000 to 20,000+ volt range, so it already has to withstand some degree of EMP to operate. That said, the car body that it is grounded to has a awful lot of metal surface area to collect EMP. So, much of it would be dependent on distance and whatever barriers exist between the car and the initial blast point.