A) 5
B) 2.4
C) 1.5
D) 1.2
Correct Answer: B
Solution :
Thermal conductivity of composite plate \[{{K}_{eq}}=\frac{2{{K}_{1}}{{K}_{2}}}{{{K}_{1}}+{{K}_{2}}}=\frac{2\times 2\times 3}{2+3}\]\[=\frac{12}{5}\]=2.4
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