Question

here please answer to this question pls please please please it's urgent and with diagram ​

Answer 1

heya!!!

l=2km=2000m

r=2mm=2/10cm=2/1000m=0.002

so the area of cross section is πr²

so area=a=3.14×0.002×0.002

we know that

resistance=resistivity×l/a

so =[1.6×(10^-8)×2000]/3.14×0.002×0.002

=(1.6×10²×10³×10³×2000)/(314×2×2×10^8)

=(16×10^8×2000)/314×4×10×10^8)
=(16×2000)/(314×40)

=5.09

hope I m right
so u can now solve it if u still need help then comment