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A slab consists of two parallel layers o...

A slab consists of two parallel layers of copper and brass of same thickness and having thermal conductivies in the ratio 4:1 . If the free face of brass is at `100^(@)C` and that of copper of `0^(@)C`, the temperature of interface is

A

`80^(@)C`

B

`60^(@) C `

C

`20^(@)C`

D

`40^(@)C`

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The correct Answer is:
C
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