Question

Two identical plates of different metals are joined to form a single plate whose thickness is double the thickness of each plate. If the coefficients of conductivity of each plate are 2 and 3 respectively, then the conductivity of composite plate will be

• A. 5
• B. 2.4
• C. 1.5
• D. 1.2

Answer 1

Answer: (B)

2.4

Answer 2

Thermal conductivity of composite plate

$= \frac { 12 } { 5 }$=2.4