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25 January, 19:11

An electric field greater than about 3*106V/m causes air to break down (electrons are removed from the atoms and then recombine, emitting light). If you shuffle along a carpet and then reach for a doorknob, a spark flies across a gap you estimate to be 1mm between your finger and the doorknob.

Estimate the voltage between your finger and the doorknob.

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  1. 25 January, 19:25
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    Could be about 3kV from the data shown in q
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