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高中物理“电场中等势线的描绘”的学生实验,是用导电纸中形成的稳恒电流场来模拟静电场.做好这一实验的关键,是选用合适的导电纸.对纸面导电层的要求是:1.涂布均匀,使各处的导电性能一致.这样才能使测出的等势线不发生畸变,得以模拟真空中的静电场.2.电阻率应远大于作为电极的金属.这样才能使金属电极成为一等势面.由于受到中学配备的检测电势差的仪表(灵敏电流计)的灵敏度的限制,导电层的电阻率也不可太大.
The high school physics experiment of “characterizing the medium electric field in the electric field” uses a steady current field formed in conductive paper to simulate the electrostatic field. The key to doing this experiment is to select the appropriate conductive paper. Conductive layer on the paper The requirements are: 1. Uniform coating, so that the electrical conductivity is consistent everywhere. In this way, the measured equipotential lines will not be distorted to simulate the electrostatic field in vacuum. 2. The resistivity should be much larger than the metal as the electrode. In this way, the metal electrode can be made to be a potential surface. Due to the sensitivity of the instrument equipped with the detection potential difference (sensitive galvanometer), the resistivity of the conductive layer is not too large.