题目内容
在右图所示的电路中,两个灵敏电流表
和
的零点都在刻度盘中央,当电流从“+”接线柱流入时,指针向右摆;电流从“-”接线柱流入时,指针向左摆.在电路接通后再断开的瞬间,下列说法中符合实际情况的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449487331750.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948608521.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948624519.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241449487331750.png)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.![]() ![]() |
B
试题分析:电路接通后线圈中电流方向向右,当电路断开时,线圈中电流减小,产生与原方向相同的自感电动势,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948624519.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948608521.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948624519.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948608521.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144948624519.jpg)
点评:解决本题的关键知道电感器对电流的变化有阻碍作用,当电流增大时,会阻碍电流的增大,当电流减小时,会阻碍其减小.
![](http://thumb2018.1010pic.com/images/loading.gif)
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