如图,Q1和Q2是两个固定的负点电荷,在它们的连线上有a、b、c三点

如图,Q1和Q2是两个固定的负点电荷,在它们的连线上有a、b、c三点,其中b点的合场强为零,现将另一正点电荷q由a点沿连线移动到c点,在移动的过程中,点电荷q的电势能变化是

A.不断减少                    B.不断增加  

C.先增加后减少                D.先减小后增大

答案

C


解析:

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