A parallelplatecondenser with installation of drying air, lighting and charging is provided, which can keep charge numbers constant in demonstration experiment.
The magnetic field distribution produced by displacement current in charging circular parallelplatecondenser is discussed by using the concept of magnetic potential.
应用磁场矢势的概念讨论了充电圆形平行板电容器中的位移电流所产生的磁场分布。
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The parallel-platecondenser type of containing wat er sensor for crude oil is used, so, the sensor is easily washed.