Question: A temperature sensor located at 4.2 K requires four Manganin instrument leads to 300 K. The length of the wires is 1 m and

A temperature sensor located at 4.2 K requires four Manganin instrument leads

A temperature sensor located at 4.2 K requires four Manganin instrument leads to 300 K. The length of the wires is 1 m and the sensor operating current (for two of the leads) is I=10 A. Calculate the required wire diameter such that the thermal conduction heat load is equal to the Joule heat (1R) when the two leads are energized.

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