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Two rods A and B of different materials ...

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are `K_(1)` and `K_(2)`. The thermal conductivity of the composite rod will be

A

`(K_1+K_2)/(2)`

B

`(3(K_1+K_2))/(2)`

C

`K_1+K_2`

D

`2(K_1+K_2)`

Text Solution

Verified by Experts

The correct Answer is:
A
`(K_1A)/(d)+(K_2A)/(d)=(K_(eq)xx2A)/(d) implies K_(eq)=(K_1+K_2)/(2)`
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