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Three rods A, B and C have the same dime...

Three rods A, B and C have the same dimensions. Their thermal conductivities are `K_(A),k_(g)andandK_(C )` respectively. A and B are placed end to end, with their free ends kept at a certain temperature difference. C is placed separately, with its ends kept at the same temperature difference. The two arrangements conduct heat at the same rate. `K_(C )` must be equal to :

A

`k_(A)+k_(B)`

B

`(k_(A)k_(B))/(k_(A)+k_(B))`

C

`1/2 (k_(A)+k_(B))`

D

`2((k_(A)k_(B))/(k_(A)+k_(B)))`

Text Solution

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The correct Answer is:
A
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