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在解答某些物理习题时,如果我们能够建立好物理“模型”,就容易找到解题的捷径,今例举如下: 电磁学中的“导体”模型 例1.如图1是电磁流量计的示意图,在非磁性材料做成的圆管道外加一匀强磁场区域,当管中的导电液体流过此磁场区域时,测出管壁上的a、b两点间的电动势就可以知道管中液体的流量Q——单位时间内流过管道横截面的液体体积(米~3/秒),已知管的直径D,磁感应强度B,试推出Q与的关系表达式。
When answering certain physical exercises, if we can establish a physical “model,” we can easily find the shortest way to solve the problem. This example is as follows: “Conductor” Model in Electromagnetics Example 1. Figure 1 shows the electromagnetic flowmeter. Schematic diagram, in the non-magnetic material made of a round pipe plus a uniform magnetic field, when the conductive liquid in the tube flow through this magnetic field, measured on the wall of the a, b between the two points of the electromotive force can be known in the tube The flow rate of the liquid Q - the volume of liquid flowing through the cross section of the pipeline per unit time (m3/sec), the diameter D of the known pipe, and the magnetic induction B, try to express the relationship between Q and.