Question

How many electrons flow when a current of 5 amperes is passed through a conductor for 200 seconds?

Answer 1

Q = It = 5×200 = 1000 coulombs

Charge carried by one electron

= 1.6 × 10⁻¹⁹C

No. of electrons in 1000 C

=1000/1.6 × 10⁻¹⁹

=6.25×10 ²¹

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Ps:- I had to hard time for the superscript thing.... Hope it helps:)

Answer 2

The number of electrons are $6.25\times 10^{21}$.

Explanation:

Given that,

Current, I = 5 A

Time, t = 200 s

We need to find the number of electrons that are flowing through the circuit. We know that the electric charge per unit time is called electric current. It is given by :

$I=\dfrac{q}{t}$

Using quantization of charges, q = ne

$I=\dfrac{ne}{t}$

$n=\dfrac{It}{e}\\\\n=\dfrac{5\times 200}{1.6\times 10^{-19}}\\\\n=6.25\times 10^{21}$

So, the number of electrons are $6.25\times 10^{21}$. Hence, this is the required solution.

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