题目内容
如图所示,电感线圈L的直流电阻
=1.0Ω,小灯泡的电阻
=5.0Ω,
=4.0Ω,接在电动势E="24" V,内电阻可忽略的电路上.闭合开关S,待电路稳定后再断开开关,则在断开开关S的瞬间( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143291452599.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329098223.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329114218.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329129220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241143291452599.jpg)
A.![]() |
B.![]() |
C.![]() |
D.![]() |
AB
断开开关S的瞬间,麟圈L产生自感电动势,相当于电源,与
、
组成闭合回路,
、
的电流大小相等;断开开关S后,L中的电流是从原来的值逐渐减小的,断开瞬间它的电流仍为4A。本题正确答案为AB。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329114218.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329129220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329114218.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114329129220.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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