One side of each sheet was covered in aluminium foil. This acted as a reflective surface for infra-red (heat) radiation, and improved the effectiveness of the insulating panel. It also happened to function as a conductor of electricity, much to the dismay of my friend.
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Voltage is defined as work per unit charge, which tells us that this fellow’s physical work of separating the attractive charges became translated into electrical voltage, which shocked him when the magnitude became great enough.
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By the way, this is an absolutely true story! This scenario could be easily replicated on a dry (low-humidity) day, with two large sheets of styrofoam insulation and a brave person pulling them apart!
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