题目内容
如图所示的电路中,电源电动势E=3 V,内电阻r=1 Ω,定值电阻R1=3 Ω,R2=2 Ω,电容器的电容C=100 μF,则下列说法正确的是 ( ).
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241516434454082.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241516434454082.jpg)
A.闭合开关S,电路稳定后电容器两端的电压为1.5 V |
B.闭合开关S,电路稳定后电容器所带电荷量为3.0×10-4 C |
C.闭合开关S,电路稳定后电容器极板a所带电荷量为1.5×10-4 C |
D.先闭合开关S,电路稳定后断开开关S,通过电阻R1的电荷量为3.0×10-4 C |
AC
试题分析:由闭合电路的欧姆定律得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241516434601245.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824151643538894.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241516437571094.png)
点评:学生会判断电路的连接方式,知道电容器两端的电压就是与其并联的用电器两端的电压,能熟练运用闭合电路的欧姆定律,电容的定义式解相关问题。
![](http://thumb2018.1010pic.com/images/loading.gif)
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