北京师大良乡附中2013-2014学年高二物理上学期期中考试试题新人教版
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1．两个分别带有电荷量-Q和+3Q的相同金属小球（均可视为点电荷），固定在相距为r的两处，它们间库仑力的大小为F。两小球相互接触后将其固定距离变为 ，则两球间库仑力的大小为
A． B． C． D．
2、如图所示，+Q1、-Q2是两个点电荷，P是这两个点电荷连线中垂线上的一点。图中所画P点的电场强度方向可能正确的是
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A． B． C． D．
2、如图所示，+Q1、-Q2是两个点电荷，P是这两个点电荷连线中垂线上的一点。图中所画P点的电场强度方向可能正确的是
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