题目

如图所示，B、C、D三点都在以点电荷十Q为圆心的某同心圆弧上，将一试探电荷从A点分别移到B、C、D各点时，电场力做功大小比较（                                                                   ）                                                                                                                                                    　   A． WAB＞WAC                 B． WAD＞WAB C． WAC=WAD      D． WAB＜WAC                                                                                                                                       答案：C

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