Nikelin and brass

Calculate the length of brass wire (ró=0.08 microohm m) and nickel (ró=0.4 microohm m) with a diameter of 0.5 mm, which has a resistance of 1 ohm

Correct answer:

a =  245.4 m
b =  49.1 m

Step-by-step explanation:

ρ1=0.08 10881010 Ωm ρ2=0.4 1084109 Ωm d=0.5 mm m=0.5:1000  m=0.0005 m R=1 Ω  R = ρ   l / S  r=d/2=0.0005/2=400010.0003 m S=π r2=3.1416 0.000321.9635107 m2  a=ρ1R S=810101 1.9635107=245.4 m
b=ρ2R S=41091 1.9635107=49.1 m

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