A composite wall consists of a thick brick layer ( ) followed by a thick plaster layer ( )

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A composite wall consists of a

10\,\text{cm}

thick brick layer (

k = 0.80\,\text{W m}^{-1}\text{K}^{-1}

) followed by a

2.0\,\text{cm}

thick plaster layer (

k = 0.20\,\text{W m}^{-1}\text{K}^{-1}

). The wall has an area of

1.0\,\text{m}^2

. If the temperatures on the two outer faces are maintained at

40^{\circ}\text{C}

and

20^{\circ}\text{C}

, calculate the steady heat current through the wall.