Task id16521
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Task id16521
The tungsten filament of an electric lamp has a length l = 20 cm and a resistance Rt = 200 Ohm at a temperature t = 2500°C. What is the diameter of the thread? Tungsten resistivity p0 = 0.056 μOhm m; temperature coefficient of resistance a = 4.2·10-3 K-1.
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Detailed solution. Format gif
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