Question

A polythene piece rubbed with wool is found to have a negative change of $6.4\times {10}^{-9}$C. How many electrons have been transferred during the process?

• A. $4\times {10}^{12}$
• B. $4\times {10}^{11}$
• C. $4\times {10}^{10}$
• D. None of these

Answer 1

Answer: (C)

$4\times {10}^{10}$

If $n$ be the transferred electron this process, then the total charge $q=ne$.

Thus, $n=\frac{q}{e}=\frac{-6.4\times {10}^{-9}}{-1.6\times {10}^{-19}}=4\times {10}^{10}$