如圖所示,在電場(chǎng)強(qiáng)度E=2000V/m的勻強(qiáng)電場(chǎng)中,有三點(diǎn)A、M和B,AM=4cm,MB=3cm,AB=5cm,且AM邊平行于電場(chǎng)線,把一電荷量q=2×109C的正電荷從B移到M點(diǎn),再從M點(diǎn)移到A點(diǎn),電場(chǎng)力做功為(    )                                                                                                                          

                                                                                                  

    A. 0.6×106J                  B. 0.12×106J    C.  ﹣0.16×106J D. ﹣0.12×106J

                                                                                                                                     

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