Ⅰ试题精选一、填空题1．利用电荷间的相互作用，人们制成了能检验物体是否带电的仪器，这种仪器叫做。（93年上海市）2．用带正电的物体接触验电器的金属球，验电器因而带电，验电器的两片金属箔因而张开。（91年吉林省）3．用一个带电小球去靠近另一个塑料泡沫小球，如果出现 I test selection I. Fill in the blank questions 1. Using the interaction between the charges, people make instruments that can test whether an object is charged. Such an instrument is called. (93 Shanghai City) 2. When a positively charged object is contacted with the metal ball of the electroscope, the electroscope is charged, and the two metal foils of the electroscope are opened. (91 Jilin Province) 3. Use a charged pellet to get close to another plastic foam pellet if present