一到有关电荷及电荷守恒定律的物理题,会的帮帮忙.如图所示,直角三角形中,AB=40cm,BC=30cm,在A、B处分别放有点电荷QA、QB,测得C处场强EC=10V/m方向平行于AB向上,可知QA、与QB (填同号、反号
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![一到有关电荷及电荷守恒定律的物理题,会的帮帮忙.如图所示,直角三角形中,AB=40cm,BC=30cm,在A、B处分别放有点电荷QA、QB,测得C处场强EC=10V/m方向平行于AB向上,可知QA、与QB (填同号、反号](/uploads/image/z/8298145-1-5.jpg?t=%E4%B8%80%E5%88%B0%E6%9C%89%E5%85%B3%E7%94%B5%E8%8D%B7%E5%8F%8A%E7%94%B5%E8%8D%B7%E5%AE%88%E6%81%92%E5%AE%9A%E5%BE%8B%E7%9A%84%E7%89%A9%E7%90%86%E9%A2%98%2C%E4%BC%9A%E7%9A%84%E5%B8%AE%E5%B8%AE%E5%BF%99.%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%AD%2CAB%EF%BC%9D40cm%2CBC%EF%BC%9D30cm%2C%E5%9C%A8A%E3%80%81B%E5%A4%84%E5%88%86%E5%88%AB%E6%94%BE%E6%9C%89%E7%82%B9%E7%94%B5%E8%8D%B7QA%E3%80%81QB%2C%E6%B5%8B%E5%BE%97C%E5%A4%84%E5%9C%BA%E5%BC%BAEC%EF%BC%9D10V%2Fm%E6%96%B9%E5%90%91%E5%B9%B3%E8%A1%8C%E4%BA%8EAB%E5%90%91%E4%B8%8A%2C%E5%8F%AF%E7%9F%A5QA%E3%80%81%E4%B8%8EQB+%EF%BC%88%E5%A1%AB%E5%90%8C%E5%8F%B7%E3%80%81%E5%8F%8D%E5%8F%B7)
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