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人教版物理选修3-2第四章第四节“电磁感应定律的应用”的“问题与练习”中第七题是一个关于电磁流量计的练习题。原题如下:图4.4-8是电磁流量计的示意图。圆管由非磁
PEP Physics Elective 3-2 Chapter 4, Section 4 “Electromagnetic induction law application ” “Problems and Exercises ” The seventh question is an exercise on the electromagnetic flowmeter. The original title is as follows: Figure 4.4-8 is a schematic electromagnetic flowmeter. Tube by non-magnetic