This would lead one to think that maybe if you use the microwave as a faraday shield, you SHOULD leave it plugged in. Why? Because that third prong on the plug, the bottom one that's slightly longer and kind of rounded, serves as the chassis ground and 'should' (if your house wiring is relatively modern) provide a solid path to ground, which would include, at a minimum, an 8 foot copper or copper-clad rod stuck in the ground somewhere near where the power lines enter the house.
I think there out to be some other method of preventing ones' absent-minded self from turning on the microwave, but maintaining that chassis ground has to be a good thing.
Possibly; my experience here in lightning country is that house grounds can be a long run to the ground rod; a surge protector can be helpful, but if the lightning hit is nearly direct everything is going to be fried. The power cord is another issue in an EMP, but I read that microwaves make good impromptu Faraday cages so I am reaching above my pay grade I suppose. Magnetic field surges require some special engineering experience.
Certainly microwave ovens are well sealed against outward leakage of the microwave generation; magnetic field intrusion is, as I say, not my field of expertise.
no no no....
Just watch the video. It has nothing to do with grounding.
Maybe I just just start selling metal storage boxes from IKEA as EMP shields and make a fortune instead of trying to explain.
My warning was unnecessary. No one turns on a microwave without putting something in first. It's not like you need to warm it up.