试题与答案

如图,a、b是两个点电荷,它们的电量分别为Q1,Q2,MN是ab连线的中垂线,P

题型:选择题

题目:

如图,a、b是两个点电荷,它们的电量分别为Q1,Q2,MN是ab连线的中垂线,P是中垂线上的一点,下列哪种情况能使P点场强方向指向MN的左侧(  )

A.Q1,Q2都是正电荷,且Q1>Q2

B.Q1是正电荷,Q2是负电荷,且Q1>|Q2|

C.Q1是负电荷,Q2是正电荷,且|Q1|<Q2

D.Q1,Q2都是负电荷,且|Q1|<|Q2|

答案:

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