如圖甲所示,100匝的線圈,橫截面積是0.1m2,線圈兩端A、B與一個理想電壓表相連.線圈中有垂直紙面向里的磁場,磁場的磁感應(yīng)強度按圖乙所示規(guī)律變化,則(                                                  )            

                                                           

    A. 電壓表的示數(shù)是2V                 B. 電壓表的示數(shù)是2.5V

    C. A點電勢高于B點                   D.    B點電勢高于A點

                                                                                                                                       

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