题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433534332.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433550321.gif)
(2)小车的位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433566311.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433581191.gif)
(3)在线圈进入磁场的过程中通过线圈某一截面的电荷量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433628199.gif)
(4)线圈和小车通过磁场的过程中线圈电阻产生的热量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433722216.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154337378264.jpg)
(1)
(2)1.6A(3)0.02C(4)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768318.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433753503.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768318.gif)
(1)在子弹射入小车的过程中,由子弹、线圈和小车组成的系统动量守恒。有
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768628.gif)
解得子弹的质量![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433753503.gif)
(2)当
时,由图象中可知线圈右边切割磁感线的速度
由闭合电路欧姆定律得
线圈中的电流![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434018607.gif)
解得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434034900.gif)
(3)由图可知,从
开始,线圈进入磁场,线圈中有感应电流,受安培力作用,小车做减速运动,速度
随位移
减小,当
时,线圈完全进入磁场,线圈中感应电流消失,小车做匀速运动,因此线圈长为
。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434330723.gif)
解得![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434330965.gif)
(4)由图象可知,线圈左边离开磁场时,小车的速度为
,线圈进入磁场和离开磁场时,克服安培力做功,线圈的动能减少,转化成电能消耗在线圈上产生电热,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434361836.gif)
解得线圈电阻发热量![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768318.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768628.gif)
解得子弹的质量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433753503.gif)
(2)当
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433862418.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434002436.gif)
线圈中的电流
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434018607.gif)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434034900.gif)
(3)由图可知,从
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434049387.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434065185.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434096182.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434112407.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434299445.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434330723.gif)
解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434330965.gif)
(4)由图象可知,线圈左边离开磁场时,小车的速度为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434346426.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115434361836.gif)
解得线圈电阻发热量
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115433768318.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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