如图所示,B为线段AC的中点,如果在A处放一个+Q的点电荷,测得B处的场强EB=48N/C,则()A.Ec=24N/CB.Ec=12N/CC.若要使Eb=0,可在C处放一个-Q的点电荷D.把Q=10的-9次方库伦的点电荷放在C点,则其所受电场力
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![如图所示,B为线段AC的中点,如果在A处放一个+Q的点电荷,测得B处的场强EB=48N/C,则()A.Ec=24N/CB.Ec=12N/CC.若要使Eb=0,可在C处放一个-Q的点电荷D.把Q=10的-9次方库伦的点电荷放在C点,则其所受电场力](/uploads/image/z/3953551-31-1.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2CB%E4%B8%BA%E7%BA%BF%E6%AE%B5AC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E5%A6%82%E6%9E%9C%E5%9C%A8A%E5%A4%84%E6%94%BE%E4%B8%80%E4%B8%AA%2BQ%E7%9A%84%E7%82%B9%E7%94%B5%E8%8D%B7%2C%E6%B5%8B%E5%BE%97B%E5%A4%84%E7%9A%84%E5%9C%BA%E5%BC%BAEB%3D48N%2FC%2C%E5%88%99%EF%BC%88%EF%BC%89A.Ec%3D24N%2FCB.Ec%3D12N%2FCC.%E8%8B%A5%E8%A6%81%E4%BD%BFEb%3D0%2C%E5%8F%AF%E5%9C%A8C%E5%A4%84%E6%94%BE%E4%B8%80%E4%B8%AA-Q%E7%9A%84%E7%82%B9%E7%94%B5%E8%8D%B7D.%E6%8A%8AQ%3D10%E7%9A%84-9%E6%AC%A1%E6%96%B9%E5%BA%93%E4%BC%A6%E7%9A%84%E7%82%B9%E7%94%B5%E8%8D%B7%E6%94%BE%E5%9C%A8C%E7%82%B9%2C%E5%88%99%E5%85%B6%E6%89%80%E5%8F%97%E7%94%B5%E5%9C%BA%E5%8A%9B)
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