A、B两个点电荷在真空中所产生电场的电场线(方向未标出) 如图所

AB两个点电荷在真空中所产生电场的电场线(方向未标出) 如图所示。图中C点为两点电荷连线的中点,MN为两点电荷连线的中垂线,D为中垂线上的一点,电场线的分布关于MN左右对称。则下列说法中正确的是                  (  )

       A.这两点电荷一定是等量异种电荷

       B.这两点电荷一定等量同种电荷

       C.DC两点的电势一定相等

       D.C点的电场强度比D点的电场强度大

答案

ACD

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