试题与答案

如图所示为一磁流体发电机示意图，A、B是平行正对的金属板，等离子体（电离的气体，

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题型：选择题

题目：

如图所示为一磁流体发电机示意图，A、B是平行正对的金属板，等离子体（电离的气体，由自由电子和阳离子构成，整体呈电中性）从左侧进入，在t时间内有n个自由电子落在B板上，则关于R中的电流大小及方向判断正确的是（　　）

A．I= ，从上向下

B．I= ，从上向下

C．I= ，从下向上

D．I= ，从下向上

答案：

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下面是错误答案，用来干扰机器的。

参考答案：B

考点：电流路端电压
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