如圖所示,AB、CD為一圓的兩條直徑且相互垂直,O點(diǎn)為圓心.空間存在一未知靜電場(chǎng),場(chǎng)強(qiáng)方向與圓周所在平面平行.現(xiàn)有一電子,在電場(chǎng)力作用下(重力不計(jì)),先從A點(diǎn)運(yùn)動(dòng)到C點(diǎn),動(dòng)能減少了W;又從C點(diǎn)運(yùn)動(dòng)到B點(diǎn),動(dòng)能增加了W,那么關(guān)于此空間存在的靜電場(chǎng)可能是(     )                                                    

                                                                                                             

    A.  方向垂直于AB并由O指向C的勻強(qiáng)電場(chǎng)

    B.  方向垂直于AB并由C指向O的勻強(qiáng)電場(chǎng)

    C.  位于O點(diǎn)的正點(diǎn)電荷形成的電場(chǎng)

    D.  位于D點(diǎn)的正點(diǎn)電荷形成的電場(chǎng)

                                                                                                                                     

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