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Two sheets of thickness d and 2d and sam...

Two sheets of thickness d and 2d and same area are touching each other on their face. Temperature `T_(A),T_(B),T_(C)` shown are in geometric progression with common ratio r = 2. Then ratio of thermal conductivity of thinner and thicker sheet are

A

A) 1

B

B) 2

C

C) `0.5`

D

D) 4

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