The resistance

What is the resistance of an aluminum wire, 0.2 km long and 10 mm in diameter?

Correct answer:

R =  0.0713 Ω

Step-by-step explanation:

l=0.2 km m=0.2 1000  m=200 m D=10 mm m=10:1000  m=0.01 m  r=D/2=0.01/2=2001=0.005 m  S=π r2=3.1416 0.00520.0001 m2 ρ=2.8 1082.8108 Ωm R=ρ l/S=2.8108 200/0.0001=0.0713 Ω

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