Question

How many electrons are there in 1 coulomb of charge?

• A. $625\times {10}^{16}$
• B. $1.6\times {10}^{–19}$
• C. $625\times {10}^{19}$
• D. $1.6\times {10}^{19}$

Answer 1

Answer: (A)

Step 1: Given that:

Charge(q) = $1C$

Step 2: Formula used:

According to the quantisation of charge;

The charge on a body is an integral multiple of the charge on an electron.

That is; $q=ne$

And $e=1.6\times {10}^{-19}C$

Where n is the number of electrons.

Step 3: Calculation of the number of electrons in the given charge:

$n=\frac{q}{e}$

Putting the given values, we get;

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

$n=0.625\times {10}^{19}$

$n=6.25\times {10}^{18}$

Thus,

In 1C there is $6.25\times {10}^{18}$ number of electrons.