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MMLU-Pro / 10322 / A wire of diameter 1 mm carrying a heavy current has a temperature of 1200°K…

Problem

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question

A wire of diameter 1 mm carrying a heavy current has a temperature of 1200°K when equilibrium has been achieved. We assume that the heat lost from the wire is purely by radiation. The temperature of the sur-roundings is 300°K, the resistivity of the wire at this temperature is 5 × 10^-8 \Omega \bullet m, and the temperature coefficient of resistance of the wire is 4 × 10^-3 per C deg. What is the magnitude of the current in the wire?

category

physics

options

  1. 35.5A
  2. 28.5A
  3. 25.0A
  4. 40.0A
  5. 50.0A
  6. 55.0A
  7. 30.0A
  8. 60.0A
  9. 20.0A
  10. 45.0A

src

stemez-Physics

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