A Brass Plate with a Thickness of 1 $^{\circ}$ C and of Copper Is 400 W/m

A brass plate with a thickness of 1.00 cm is placed over a copper plate with a thickness of 2.00 cm.The coefficient of thermal conductivity of brass is 100 W/m $^{\circ}$ C and of copper is 400 W/m $^{\circ}$ C.What is the effective coefficient of thermal conductivity for the brass-copper layer?

A) 150 W/m $^{\circ}$ C
B) 200 W/m $^{\circ}$ C
C) 250 W/m $^{\circ}$ C
D) 300 W/m $^{\circ}$ C
E) 350 W/m $^{\circ}$ C

Correct Answer:

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