Physics - Electrostatics Question with Solution | TestHub

Charge is quantised: $q=ne$ with $e=1.6\times 10^{-19}\mathrm{C}$.

$\frac{16\times 10^{-30}}{1.6\times 10^{-19}}=10^{-10}$, not an integer, so $16\times 10^{-30}\mathrm{C}$ is not possible. Option (B).