A 15m long copper wire is cooled at 40 °C. At the end of the process, the length change of the 30080 (aL=16.5 x 10-6 (°C)-1 for Cu) 30080 b2001000 b2001000 30080 20080 b2001000 30080 b2001000

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A: The current can be pass through the conductive material.

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A: specific resistance s=10.3×10-6×10-2Ωm Resistance R=4Ω at 0°c Diameter d=0.0274cm

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