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KaiZX
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可能是一个基本的物理问题...
鉴于一个贯穿电流I线，我们可以找到一些距离r从距导线中心的磁场B。我想知道什么是，如果我有一个永久磁铁一些距离r远离电线，我将如何找到整体的磁力在磁铁？
鉴于一个贯穿电流I线，我们可以找到一些距离r从距导线中心的磁场B。我想知道什么是，如果我有一个永久磁铁一些距离r远离电线，我将如何找到整体的磁力在磁铁？
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<a href="http://www.komputerswiat.pl/testy/sprzet/ladowarki/2011/06/test-ladowarek-podroznych-modele-solarne.aspx"> <img align="left" src="http://www.komputerswiat.pl/media/2011/175/1931731/x.jpg" /></a> Alternatywne sposoby ładowania laptopa i telefonu - ładowarka na słońce lub z własnym akumulatorem. Zobaczcie, czy takie urządzenie warto zabrać ze sobą na wypad za miasto.<img width='1' height='1' src='http://rss.feedsportal.com/c/32559/f/491281/s/1625174f/mf.gif' border='0'/><br/><br/><a href="http://da.feedsportal.com/r/106215699200/u/0/f/491281/c/32559/s/1625174f/a2.htm"><img src="http://da.feedsportal.com/r/106215699200/u/0/f/491281/c/32559/s/1625174f/a2.img" border="0"/></a>
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