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# ? ? ? ? - PowerPoint PPT Presentation

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1．作用：内能转变为电能的装置。

2．原理：最终是一个速度选择器。

3．思考：其电压的最大值为多大?

(给出离子速度、磁感应强度、两板间距离)。

A

a→b

1例、目前世界上正在研究的一种新型发电机叫磁流体发电机，图、作用：测量可导电流体(如污水)在管中的流量。

2、原理：

① ．在洛仑兹力的作用下，粒子在上、下侧面累积，形成累积电场，最终形成速度选择器。

② ．测出上下两点的电势差，管的直径，面积就可以计算出流量。

③ ．如果有外电路，则用闭合电路欧姆定律计算，可以计算电流与流量的关系。

qvB=qE场

= qU/d

=qE/d

v=E/Bd

=Sl/t

=Sv

Q=πdE/4B

S=πd2/4

v=I(R+ c/ab)/Bc；