An uncoated, solid cable of length l = 1 m and diam- eter d = 40 mm is exposed to convection conditions characterized by h = 55 w/m2⋅k and t[infinity] = 20°c. determine the maximum electric current that can be carried by the cable if it is pure copper, pure aluminum, or pure tin. calculate the corresponding minimum wire temperatures. the electrical resistivity is rhoe = 10 × 10−8 ω ⋅ m for copper and aluminum at their melting points, while the electrical resistivity of tin is rhoe = 20 × 10−8 ω ⋅ m at its melting point.

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