Question

Charge of number of electrons together make up 1 coulomb of charge.

• A. $6.25\times {10}^{18}$
• B. $1.674\times {10}^{18}$
• C. $1.672\times {10}^{18}$
• D. $9.1\times {10}^{18}$

Answer 1

The correct option is A $6.25\times {10}^{18}$

Charge of 1 electron is equal to $1.60\times {10}^{-19}$ coulomb. To find number of electrons in 1 coulomb:
1 electron = $1.60\times {10}^{-19}$ coulomb.
$x$ electrons = 1 coulomb.
$\Rightarrow$$x=\frac{1}{1.60\times {10}^{-19}}$
$\Rightarrow$$x=6.25\times {10}^{18}$.
Thus 1 coulomb of charge contains $6.25\times {10}^{18}$ number of electrons.