What is the resistance of a 1.6 m -long copper wire that is 0.40 mm in diameter?

Question

What is the resistance of a 1.6 m -long copper wire that is 0.40 mm in diameter?

Express your answer using two significant figures.

What is the resistance of a 20 cm -long piece of iron with a 1.5 mm × 1.5 mm square cross section?

Express your answer using two significant figures.

Part A What is the resistance of a 1.6 m -long copper wire that is 0.40 mm in diameter? Express your answer using two significant figures. R= Submit My Answers Give Up Incorrect; Try Again; 29 attempts remaining Part B What is the resistance of a 20 cm-long piece of iron with a 1.5 mm × 1.5 mm square cross section? Express your answer using two significant figures. R=

Explanation / Answer

resistance=resistivity*length/area

for copper

resistivity=1.68*10^(-8)

length=1.6 m

area=pi(radius^2)=1.25*10^(-7) m^2

resistance=0.21 ohm

for iron

resistivity=9.71*10^(-8)

length=20 cm=0.2m

area=1.5*1.5=2.25 mm^2=2.25*10^(-6) m^2

resistance=8.6*10^(-3) ohm

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