Question

how many electrons past were conducted in 0.2 second if the current passing through it is 0.5 a the answer of this question is 6.25 multiply 10 raise to power 17 but the 6.25 comes I don't know please help me ​

Answer 1

Answer:

Q = ne

where Q is the total charge, n is the number of electrons, and e is the charge on 1 electron

e is a constant with charge 1.6×$10^{-19}$C ( which is the charge on 1 electron)

In the question, you are given the current(I)(=0.5A) you know the charge on 1 electron(because it is constant)(e = 1.6×$10^{-19}$C), and you have to find out the number of electrons(n):

To find out total charge(Q):

I =  $\frac{Q}{t}$

⇒Q = It

⇒0.5A × 0.2 sec

⇒0.1C = Q

Now we know that the total charge is 0.1C

we can figure out number of electrons:

Q = ne

⇒n = $\frac{Q}{e}$

⇒0.1C/1.6×$10^{-19}$C

⇒6.25×$10^{17}$