A polythene bag rubbed with a woollen jersey is found to have a negative change of $3 \times 10^{-7} C$. The number of electrons transferred from woollen jersey to the polythene would be:

$1.875 \times 10^{12}$

The correct answer is Option (2) → $1.875 \times 10^{12}$

To find the number of electrons transferred (n), 

$Q=n×e$ [Q - Charge transferred]

$⇒n=\frac{Q}{e}=\frac{3×10^{-7}}{1.6×10^{-19}}=1.875×10^{12}$