Question

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are K1 and K2. The thermal conductivity of the composite rod will be

• A. $\frac {K_1+K_2}{2}$
• B. $\frac {3(K_1+K_2)}{2}$
• C. $K_1+K_2$
• D. $3(K_1+K_2)$

Answer 1

Answer: (A)

$\frac {K_1+K_2}{2}$

Answer 2

The correct option is (A): $\frac {K_1+K_2}{2}$.