In the Ingen Hauz’s experiment the wax melts up to lengths $10$ and $25 cm$ on two identical rods of different materials. The ratio of thermal conductivities of the two materials is
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(a) $K \propto {l^2} \Rightarrow \frac{{{K_1}}}{{{K_2}}} = \frac{{l_1^2}}{{l_2^2}} = {\left( {\frac{{10}}{{25}}} \right)^2} = \frac{1}{{6.25}}$
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