题目内容
(8分)某地地磁场的磁感应强度方向斜向下指向地面,与竖直方向成60°角,大小为5 ×10-5T。一灵敏电压表通过导线连接在当地入海河段的两岩的接线柱上,接线柱与水接触良好。已知该河段的两岸南北正对,河宽200m,该河段涨潮和落潮时有海水(视为导体、电阻极小)流过。设落潮时,海水自正西向正东流,流速为4m/s。
(1)该河段的南岸和北岸,那边电势高?
(2)灵敏电压表的示数是多少?
(1)该河段的南岸和北岸,那边电势高?
(2)灵敏电压表的示数是多少?
(1)北岸是正极,电势高
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122031057447.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122031057447.gif)
解:(1)海水在落潮时自
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412203121372.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082412203122872.gif)
(2)地磁场竖直向下的分量为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122031244723.gif)
根据法拉第电磁感应定律
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122031384431.gif)
代入数据解得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824122031400619.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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