The heat flux (from outside to inside) across an insulating wall...

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The heat flux (from outside to inside) across an insulating wall with thermal conductivity, K = 0.04 W/m.°K and thickness 0.16 m is 10 W/m². The temperature of the inside wall is -5°C. The outside wall temperature is

A. 25°C

B. 30°C

C. 35°C

D. 40°C

Answer: Option C

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