Two rods \(A\) and \(B\) of different materials are welded together as shown in the figure. Their thermal conductivities are \(K_1\) and \(K_2.\) The thermal conductivity of the composite rod will be:
            

1. \(\frac{3(K_1+K_2)}{2}\) 2. \(K_1+K_2\)
3. \(2(K_1+K_2)\) 4. \(\frac{(K_1+K_2)}{2}\)
Subtopic:  Conduction |
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