题目内容
金属杆a b水平放置在某高处,当它被平抛进入方向坚直向上的匀强磁场中时(如图所示),以下说法中正确的是 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250001207593319.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250001207593319.png)
A.运动过程中感应电动势大小不变,且Ua>Ub |
B.运动过程中感应电动势大小不变,且Ua<Ub |
C.由于速率不断增大,所以感应电动势不断变大,且Ua>Ub |
D.由于速率不断增大,所以感应电动势不断变大,且Ua<Ub |
A
试题分析: 根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000120775714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000120790590.png)
Ua>Ub,所以A正确。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000120775714.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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