Question

A polythene piece rubbed with wool is found to have a negative charge of $3\times {10}^{-7}C$. Estimate the number of electrons transferred from wool to polythene.

Answer 1

Given the charge, $Q=3\times {10}^{-7}C$

We have to find the number of electrons transferred.

So, for this we use the formula $Q=ne$

where $Q=$ total charge

$n=$ number of electron transferred

$e=$ charge on one electron $=1.6\times {10}^{-19}C$

So, $n=\frac{Q}{e}=\frac{3\times {10}^{-7}}{1.6\times {10}^{-19}}$

$=1.875\times {10}^{12}$ electrons

$\approx 2\times {10}^{12}$ electrons