Question

When ${10}^{19}$ electrons are added to a neutral metal plate through some process, the charge on it becomes:

• A. $1.6\text{C}$
• B. $-{10}^{19}\text{C}$
• C. ${10}^{-19}\text{C}$
• D. $-1.6\text{C}$

Answer 1

The correct option is D $-1.6\text{C}$

Given, number of electrons injected, $n={10}^{19}$
Charge on one elctron is $e=-1.6\times {10}^{-19}\text{C}$.
Total charge added to the metal plate, $Q=ne$
$\Rightarrow Q={10}^{19}\times -1.6\times {10}^{-19}=-1.6\text{C}$