Question

How many electrons constitute a charge of 1 coulomb?

• A. $7.25\times {10}^{18}$
• B. $6.25\times {10}^{18}$
• C. $7.25\times {10}^{28}$
• D. $6.25\times {10}^{28}$

Answer 1

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

Charge on 1 electron is $e=-1.6\times {10}^{-19}C$

So, number of electrons making up $1C$ os charge is:
$n=\frac{1}{e}$
$n=\frac{1}{1.6\times {10}^{-19}}$
$n=6.25\times {10}^{18}$