Heat is lost through a brick wall (k = 0.72 W/m K), which is 4 m

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Heat is lost through a brick wall (k = 0.72 W/m · K), which is 4 m long, 3 m wide, and 25 cm thick at a rate of 500 W. If the inner surface of the wall is at 22°C, the temperature at the midplane of the wall is
(a) 0°C

(b) 7.5°C

(c) 11.0°C

(d) 14.8°C

(e) 22°C

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