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Physics-

General

Easy

Question

The temperature of the two outer surfaces of a composite slab, consists of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x respectively $text are end text T subscript 2 end subscript text end text$ and $text end text T subscript 1 end subscript open parentheses T subscript 2 end subscript greater than T subscript 1 end subscript close parentheses$
The rate of heat transfer through slab, in a steady state is $open square brackets fraction numerator A open parentheses T subscript 2 end subscript minus T subscript 1 end subscript close parentheses K over denominator x end fraction close square brackets f$ with f equals to

1
½
2/3
1/3

The correct answer is: 1/3

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