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在初中物理第二册《简单的电现象》一章中经常遇到这样的向题:“怎样利用一根玻璃棒、一块绸子和验电器来判别带电物体带什么电。”关于这个问题一般的解法是:先用绸子摩擦过的玻璃棒接触验电器的金属球,验电器的金属箔因带正电而张开一定的角度,然后再让带电物体与验电器的金属球接触,如果验电器的金属箔张开的角度增大了,说明该物体带正电;如果验电器的金属
In the second chapter of the junior high school physics book “Simple Electrical Phenomenon” I often encountered this problem: “How to use a glass rod, a piece of silk cloth, and an electroscope to discern what kind of electricity a charged object carries.” About this issue The general solution is: first contact the metal ball of the electroscope with a glass rod that has been rubbed with silk, the metal foil of the electroscope has a certain angle because it is positively charged, and then let the charged object come into contact with the metal ball of the electroscope. The angle of opening of the metal foil of the electroscope has increased, indicating that the object is positively charged; if the metal of the electroscope