Question

How many electrons are there in 1 coulomb of charge?

• A. 625 × 10¹⁶
• B. 1.6 × 10^–19
• C. 625 × 10¹⁹
• D. 1.6 × 10¹⁹

Answer 1

The correct option is A

625 × 10¹⁶

We know that charge is quantized

i.e. Q = $n{e}^{-}$

where Q = amount of charge

n = Number of electrons

$e^{-}$ = charge on 1 electron

$\therefore 1C=n\times 1.6\times {10}^{–19}C$

$\frac{1}{1.6\times {10}^{-19}}=n$

Hence it takes $6.25\times {10}^{18}$ electrons to make 1 C of charge!!! INDEED A HUGE NUMBER.