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在物理教学中,通常采用下面方法做静电屏蔽演示实验,使带正电的金属球靠近验电器,由于静电感应,验电器的箔片就张开,这表明验电器受到了附近的带电体形成电场的影响。如果事先用一个金属网罩把验电器罩住,再让带电金属球靠近,验电器的箔片就不张开。这个实验固然能够很好地说明金属网罩具有屏蔽作用,但此演示在课堂上成功率低(气温及空气湿度影响较大),再加上验电器的
In physics teaching, the following methods are usually used to conduct electrostatic shielding demonstration experiments, so that the positively charged metal ball close to the electroscope, due to electrostatic induction, the foil of the electroscope will open, indicating that the electroscope has been subjected to a nearby charged body to form an electric field Impact. If the electroscope is covered with a metal mesh cover in advance and the charged metal ball is brought closer, the foil of the electroscope will not open. Although this experiment can well demonstrate that the metal mesh cover has a shielding effect, this demonstration has a low success rate in the classroom (significant influence of temperature and air humidity), together with the electroscope