A polythene piece rubbed with wool is found to have negative charge of `3 xx 10^-7 C`. Estimate the number of electrons transferred.

Options

A. `2.5xx10^(12)` from wool to polythene
B. `1.5xx10^(12)` from polythene to wool
C. `2.56xx10^(-15)` from wool to polythene
D. `10^(-13)` from wool to polythene.

Answer

A

Explanation

q = "ne"
`therefore" "n=q/e=(4xx10^(-7))/(1.6xx10^(-19))=2.5xx10^(12)`