An 80 cm long wire is made by welding a 3.9diameter, 20 cm long copper wire to a

Question

An 80 cm long wire is made by welding a 3.9diameter, 20 cm long copper wire to a 3.9 diameter, 60 cm long iron wire at normal room temperature (20 ). When two wires are connected end to end, their resistances add together. The resistivity of copper is and the of iron is . The temperature coefficients are: copper = and iron = . A. What is the resistance of the iron section of wire? Express your answer in milliohms. B. What is the resistance of the copper section of wire? Express your answer in milliohms. C. What is the resistance of the composite wire? Express your answer in milliohms. d. If the temperature of the wire is raised to 100 , what is the resistance of the wire? Express your answer in milliohms. Thanks

Explanation / Answer

A. What is the resistance of the iron section of wire

Resistance = resistivity * length/area

if resistivity of iron is 1.0

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