How did Walther Lewin arrive to the result W = x*(σ/2ε0) in 3:00-4:00? Ie, why did he take the average? I don't get it entirely.
http://www.youtube.com/watch?v=7NUbsQt-G9U
http://www.youtube.com/watch?v=7NUbsQt-G9U
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