题目内容
(1)设t=0时线圈的速度为零且正在斜面上某处,求此时线圈的加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520428213.gif)
(2)求线圈能达到的最大速率
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520444309.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241155204598389.jpg)
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520490477.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520475843.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520490477.gif)
(1)在t=0时,线圈内产生的感应电动势为
(2分)
线圈中电流大小为:
(2分)
线圈所受安培力:
(2分)
线圈的加速度:
(2分)
(2)当线圈做匀速运动时速率最大,此时线圈内产生的感应电动势为:
(2分)
线圈中电流大小为:
(2分)
线圈所受安培力:
(2分)
线圈所受合力为0,有:
(2分)
代入数据解得:
(2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520506621.gif)
线圈中电流大小为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520522692.gif)
线圈所受安培力:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520537684.gif)
线圈的加速度:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520475843.gif)
(2)当线圈做匀速运动时速率最大,此时线圈内产生的感应电动势为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520568577.gif)
线圈中电流大小为:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520584745.gif)
线圈所受安培力:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520600836.gif)
线圈所受合力为0,有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520600557.gif)
代入数据解得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115520490477.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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