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高中物理课本下册P49练习六(4):“图1-45是一个放在不导电的液体里的电容器,试说明液面的升降对电容的影响。想想看,用这种装置能否测出液面的高低。”部编教学参考资料对该题解答为:“这样的装置可以测出液面的高低,液面升高,电容器的电容变大,在电容器带电量一定时,两极间的电势差变小,根据电势差的变化可测出液面的高低。”
High school physics lesson booklet P49 Exercise six (4): “Figure 1-45 is a capacitor placed in a non-conductive liquid, trying to explain the influence of the lifting and lowering of the liquid surface on the capacitance. Think about it, can you use this kind of device? The level of the liquid level was measured.” The department’s teaching reference materials answered: “This device can measure the level of the liquid, the liquid level rises, and the capacitance of the capacitor becomes larger. When the capacitor charge is constant, the two poles The potential difference between them becomes smaller, and the level of the liquid level can be measured based on the change in the potential difference."