题目内容
如图所示的电路中,电源有不可忽略的电阻,R1、R2、R3为三个可变电阻,电容器C1、C2所带电荷量分别为Q1和Q2,下面判断正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241509315581880.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241509315581880.jpg)
A.仅将R1增大,Q1和Q2都将增大 |
B.仅将R2增大,Q1和Q2都将减小 |
C.仅将R3增大,Q1和Q2都将不变 |
D.突然断开开关S,Q1和Q2都将不变 |
C
试题分析:闭合电路动态分析,电路中任意部分电阻增大总电阻增大,任意部分电阻减小总电阻减小。由题图可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150931589570.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150931683616.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150931870377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932073361.png)
A、仅将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932182327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932291362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150931870377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932494383.png)
B、仅将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932073361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932291362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150931870377.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932494383.png)
C、仅将
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150933087365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932291362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932494383.png)
D、突然断开开关S,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150933492339.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932182327.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932073361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150933087365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150933882372.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932073361.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150933087365.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932291362.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824150932494383.png)
故选C
点评:中等难度。对含容电路工作状态分析,其关键是电路结构分析和电容两端电压的判断.
![](http://thumb2018.1010pic.com/images/loading.gif)
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