题目内容
竖直放置的一对平行金属板的左极板上用绝缘线悬挂了一个带正电的小球,将平行金属板按图所示的电路图连接.绝缘线与左极板的夹角为
.当滑动变阻器R的滑片在a位置时,电流表的读数为I1,夹角为
;当滑片在b位置时,电流表的读数为I2,夹角为
,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250008099632652.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000809901297.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000809916325.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000809948360.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250008099632652.jpg)
A.I1<I2 | B.I1=I2 | C.![]() | D.![]() |
BD
试题分析:电容器稳定后相当于开路,对电路没有影响,故滑片移动时,对电路中电流没有影响,即
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000810026406.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250008100721350.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000809901297.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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