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/20140824/201408241943386362489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241943386362489.png)
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:合上开关S时,通过线圈的电流增大,则产生感应电流,阻碍电路电流的增大,所以灯泡
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194339010342.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194340414367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194340414367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194340414367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824194340414367.png)
故选AB
点评:自感现象是特殊的电磁感应现象,同样遵守楞次定律和法拉第电磁感应定律.
![](http://thumb2018.1010pic.com/images/loading.gif)
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