http://annum_per_annum.livejournal.com/ ([identity profile] annum-per-annum.livejournal.com) wrote in [personal profile] sly2m 2016-03-10 07:49 am (UTC)

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В первом уравнении греческой буквой "ро" обозначен не заряд (его традиционно буквой "q" обозначают), а плотность стороннего (свободного) электрического заряда.
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