1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?
问题描述：
1.How many electrons have removed from a positively charged pith-ball electroscope if it has a charge of 7.5×10^-11C?
2.What is the charge in coulombs on an object that has
(1)An excess of 6.25×10^19 electrons?
（2）An deficiency of 1.0×10^8 electrons?
答
1.一个电子电荷e=-1.6*10^-19C 验电器上移走的电子数=Q/e=7.5*10^-11/1.6*10^-19=46875*10^42.物体所带电荷等于多余或缺少电子的总电量(1)多余电子带电荷Q=(-1.6*10^-19)6.25*10^19=-1.6*6.25C=-10C(2)缺少电子带电...