题目内容
如图所示,电源电动势为E,内 电 阻为 r。两电压表可看作是理想电表,当闭合开关,将滑动变阻器的滑片由左端向右端滑动时(设灯丝电阻不变),下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500010428511103.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/2014082500010428511103.png)
A.小灯泡L2变暗,V1表的示数变小,V2表的示数变大 |
B.小灯泡L2变亮,V1表的示数变大,V2表的示数变小 |
C.小灯泡L1变亮,V1表的示数变大,V2表的示数变小 |
D.小灯泡L1变暗,V1表的示数变小,V2表的示数变大 |
C
试题分析:由电阻定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104379595.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104394616.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104410549.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104426528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104441377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000104457576.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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