Question

A polythene piece rubbed with wool is found to have a negative charge of $6\times {10}^{-7}C$. The number of electrons transferred to polythene from wool is

• A. $3.75\times {10}^{10}$
• B. $9.6\times {10}^{10}$
• C. $9.6\times {10}^{12}$
• D. $3.75\times {10}^{12}$

Answer 1

Answer: (D)

$3.75\times {10}^{12}$

Here $q=-6\times {10}^{-7}C$
$\therefore$ Number of electrons transferred from wool to polythene $n=\frac{q}{e}=\frac{-6\times {10}^{-7}}{-1.6\times {10}^{-19}}=3.75\times {10}^{12}$