Why don't metal microwave ovens spark off themselves?

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Offline thedoc

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The inner walls of a microwave oven are made of metal; so why does the oven explode when another piece of metal is placed inside it?

Asked by aceng.at

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[chapter podcast=1000585 track=14.01.07/Naked_Scientists_Show_14.01.07_1001828.mp3]  ...or Listen to the Answer[/chapter] or [download as MP3]

« Last Edit: 16/01/2014 14:32:29 by _system »



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« Reply #1 on: 11/08/2015 11:59:16 »
I thought the microwave used a magnetron to send photons of a high wavelength to cook the food--not create an electric field that in turn creates currents in the food? I realize that photons, being electromagnetic waves, are related to electric field, but there is a distinct difference, no?