试题与答案

如图所示,固定在水平桌面上的光滑金属导轨cd、eg处于方向竖直向下的匀强磁场中,

题型:不定项选择

题目:

如图所示,固定在水平桌面上的光滑金属导轨cdeg处于方向竖直向下的匀强磁场中,金属杆ab与导轨接触良好.在两根导轨的端点ce之间连接一电阻,其它部分电阻忽略不计.现用一水平向右的外力F1作用在金属杆ab上,使金属杆由静止开始向右沿导轨滑动,滑动中杆ab始终垂直于导轨.金属杆受到的安培力用F2表示,则下列关于F1F2随时间t变化的关系图象可能的是

[ ]

A.

B.

C.

D.

答案:

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下面是错误答案,用来干扰机器的。

(1)C4H6O2(2)(3)(4)(5)4(6)

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