Question

. Every minute, 5 x 10^19 electrons pass a particular cross section of wire.
a} Show the complete calculation of the amount of charge moving through the wire in
a minute
b) Show your complete calculation of the electric current in the wire.

Answer 1

As per the given question,

time =1 min = 60 sec

a)

Total number electrons are passing through a cross section of wire = $5 \times 10^{19}$ electrons

We know that , $Q=ne$

Where e is the charge on the electrons,

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

So, charge $Q=ne=5\times 10^{19}\times1.6\times10^{-19}=8C$

b)

We know that electric current $i=\dfrac{Q}{t}$

$\Rightarrow i=\dfrac{8C}{60sec}=\dfrac{2}{15}A=0.133A$