题目内容
如图的螺线管,横截面积为S、匝数为N、电阻为r ,螺线管与一根电阻为2 r 的金属丝连接,向右穿过螺线管的匀强磁场随时间变化的规律如图,求0至t0时间内:
(1)通过金属丝的感应电流大小和方向
(2)金属丝中感应电流产生的焦耳热量Q
(3)金属丝中流过的感应电量q![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335112445586.png)
(1)通过金属丝的感应电流大小和方向
(2)金属丝中感应电流产生的焦耳热量Q
(3)金属丝中流过的感应电量q
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335112445586.png)
(1)
电流方向a→b(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133511572767.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133511416838.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133511447975.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824133511572767.png)
由法拉第电磁感应定律求出电动势,再根据欧姆定律求出电流,由楞次定律判断出方向;根据焦耳定律求热量;根据电流的平均值求出电量。
(1)根据法拉第电磁感应定律有:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335116501149.png)
根据闭合电路欧姆定律有:
,根据楞次定则,电流方向a→b。
(2)根据焦耳定律![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335117751443.png)
(3)金属丝中流过的感应电量q=
。
(1)根据法拉第电磁感应定律有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335116501149.png)
根据闭合电路欧姆定律有:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335117281084.png)
(2)根据焦耳定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335117751443.png)
(3)金属丝中流过的感应电量q=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241335118211130.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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