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Physics-

General

Easy

Question

No heat flows through the central rod of conductivity $K subscript 5 end subscript$ in the arrangement of five identical rods of different conductivity $K subscript 1 end subscript comma text end text K subscript 2 end subscript comma text end text K subscript 3 end subscript comma text end text K subscript 4 end subscript$ and $K subscript 5 end subscript.$ Temperature are constant at $A open parentheses T subscript A end subscript close parentheses$ and at $B open parentheses T subscript B end subscript close parentheses$ then

$K_{1} = K_{2}, K_{2} = K_{3}$
$\frac{K_{1}}{K_{4}} = \frac{K_{2}}{K_{3}}$
$\frac{K_{1} K_{4}}{K_{2} K_{3}} = 1$
$\frac{K_{1} K_{2}}{K_{3} K_{4}} = 1$

The correct answer is: $fraction numerator K subscript 1 end subscript text end text K subscript 2 end subscript over denominator text end text K subscript 3 end subscript text end text K subscript 4 end subscript end fraction equals 1$

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