题目内容
如图所示的电路中,A1和A2是两个相同的灯泡,线圈L自感系数足够大,电阻可以忽略不计.下列说法中正确的是:( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241857518774980.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241857518774980.jpg)
A.合上开关S时,A2先亮,![]() |
B.断开开关S时,A1和A2都要过一会儿才熄灭 |
C.断开开关S时,A2闪亮一下再熄灭 |
D.断开开关S时,流过A2的电流方向向右 |
AB
试题分析:当闭合开关的瞬间,穿过线圈的电流增大,所以会产生自感电流,阻碍原电流的增大,而
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185751892332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185751892332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185752641354.png)
当断开开关的瞬间,线圈中的电流减小,所以会产生自感电流,阻碍原电流的减小,此时线圈,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185751892332.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824185752641354.png)
故选AB
点评:当开关闭合时,需要判断线圈和谁串联,当开关断开时,需要判断线圈和谁组成一个回路
![](http://thumb2018.1010pic.com/images/loading.gif)
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