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2. Thermal energy generated by the electrical resistance of a 5 mm diameter and 4 m long bare cable is dissipated to the surrounding

2. Thermal energy generated by the electrical resistance of a 5 mm diameter and 4 m long bare cable is dissipated to the surrounding air at 20 C. The voltage drop and the electric current across the cable in steady operation are measured to be 60 V and 1.5 A, respectively. Disregarding radiation, estimate the surface temperature of the cable. Evaluate the properties at 70C. [123 C]

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