1.How many electrons have removed from a positively charged

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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?

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*10^4
2.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)缺少电子带电荷Q=(1.6*10^-19)*10^8=1.6*10^-11C

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