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Definition: Faraday cage


A shielded enclosure used to block electric fields from reaching its content. Constructed of metal, the cage conducts current on its exterior but prevents it from reaching inside. The Faraday cage was invented by physicist Michael Faraday in 1836.

Home-made cages are made by wrapping a cardboard box with aluminum foil or using metal garbage cans or anti-static bags. Items placed inside can also be wrapped with layers of aluminum foil. See EMP and Farad.