A polythene piece rubbed with wool is found to have a negative charge of `3 xx 10^(-7)C.`
a. Estimate the number of electrons transferred (from which to which?)
b. Is there a transfer of mass from wool to polythene?

Explanation

`q= 3 xx 10^(-7)C`
a. `q=nc, n=q/c =(3 xx 10^(-7))/(1.6 xx 10^(-19)) =2 xx 10^(12)` (Since polythene has negative charge, electrons are transferred from wool to polythene).
b. Yes, Mass transferred `=n xx m_(c)=9.1 xx 10^(-31) xx 2 xx 10^(12)=1.82 xx 10^(-18)kg`