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 
and of copper is 400 W/m 
What is the effective coefficient of thermal conductivity for the brass-copper layer?
A. 150 W/m 
B. 200 W/m
C. 250 W/m
D. 300 W/m
E. 350 W/m
B. 200 W/m
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