A polythene piece rubbed with wool is found to have a negative charge of $8 × 10^{-10}C$. What is the number of electrons transferred?

$5×10^9$; wool to polythene

The correct answer is Option (3) → $5×10^9$; wool to polythene

Relationship between charge and charge (q) of a single electron (e),

$q = ne$

$⇒n = \frac{q}{e} = \frac{-8\times 10^{-10}}{-1.6\times 10^{-19}}$

$= 5\times 10^9$