实验一　用一根与毛皮摩擦过的玻璃棒去接触已带负电的验电器的金属球 .观察　验电器的金属箔张角变大 .思考　课本上指出摩擦过的玻璃棒带正电 ,实验中应会发生电的中和使验电器的金属箔张角变小 ,为何会变大呢 ?原来 ,两种物体摩擦后各带什么电荷 ,是由两种物质的原子核对核 Experiment 1 used a glass rod that had been rubbed with fur to contact the metal ball of the electroscope that had been negatively charged. Observe that the angle of the metal foil of the electroscope increased. Thinking textbooks pointed out that the frictional glass rod was positively charged. The neutralization of electricity should make the angle of the metal foil of the electroscope smaller. Why does it become larger? What kind of charge does each of the two objects have after rubbing? It is the nuclear repulsion of two substances.