Charge of `3.2 xx 10^(-7)` C is obtained by rubbing a place of polythene with flannel. How many electrons are transferred? Is any mass transferred from flannel to polythene?

Explanation

Since polythene has negative charge, electrons are transferred from flannel to polythene.
Number of electrons transferred =`"total charge transferred"/" charge of an electron"`
`=(3.2 xx 10^(-7)) / (1.6 xx 10^(-19))`
`= 2 xx 10^12`
Here some mass is transferred from flannel to polythene.
Mass transferred = number of electrons transferred x mass of an electron
=` 2 xx 10^(12) xx 9.1 xx 10^(-31)`
`= 1.82 xx 10^(-18)` kg.