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A bar of Brass is used to conduct heat between two heat reservoirs at temperature of 20 degree Celsius and 80 degree Celsius. the bar

A bar of Brass is used to conduct heat between two heat reservoirs at temperature of 20 degree Celsius and 80 degree Celsius.  the bar has a square cross section with edge 1.0 cm. the length of the bar is 70 cm. what is the rate of thermal conductivity?


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