Question #b8ad5

1 Answer
Apr 20, 2017

0.2377 Omega

Explanation:

To find the resistance of a copper wire with given parameters we use
R=(rho*l)/A
(1.68*10^(-8)*25)/(3.14*5.627*10^(-7))=0.2377Omega

According to your confusion ..
we got diameter=1.5mm which is equal to 0.0015 m
but in scientific notion we write it 1.5*10^(-3)m
Dividing it by 2 we get ..
0.75*10^(-3)m=7.5*10^(-4)m