Question

How many electrons pass through a conductor in 0.2s if the current passing through it is 0.5a?

Answer 1

1 Ampere of charge flowing per second contains 1.6*10^19 electrons

In this case, If 0.5 A flows in 0.2 seconds; 2.5 Ampere of charge would flow per second.

Therefore No. of electrons would be 1.6*10^19*2.5

=4*10^19 electrons

Answer 2

q=ne

i=q/t

so i=ne/t

i= .5a

t= .2s

.5=n x 1.6 x10^-6/.2

n=.5 / 8 x 10^-6

n= .5 x 10^6/8

n=0.0625 x 10^6

n =6.25 x 10^4