http://www.youtube.com/watch?v=7NUbsQt-G9U&feature=player_embedded#!
watch the first 3 min. Great Professor friend of mine.
Suppose two thin flat plates measure 3.5m x 3.5m and are separated by 6.5mm. They are oppositely charged with +-20microCoulombs. Estimate the total force exerted by one plate on the other (ignore edge effects).
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