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. $3.75 \times10^{12}$

Answer 1

Answer: (D)

Here, $q = - 6 \times 10^{-7}\, C$
$\therefore $ Number of electrons transferred from wool to polythene, $n=\frac{q}{e}=\frac{-6\times10^{-7}}{-1.6\times10^{-19}}=3.75\times10^{12}$