Two rectangular blocks, having identical dimensions, can be arrange...

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Two rectangular blocks, having identical dimensions, can be arranged either in configuration-I or in configuration-II as
\( \mathrm{P} \) shown in the figure, one of the blocks has thermal conductivity \( k \) and the other \( 2 k \). The temperature difference
W between the ends along the \( x \)-axis is the same in both the configurations. It takes \( 9 s \) to transport a certain amount of heat from the hot end to the cold end in the configuration I. The time to transport the same amount of heat in the configuration II is
[JEE 2013]
Configuration I
Configuration II
(a) \( 2.0 \mathrm{~s} \)
(b) \( 3.0 \mathrm{~s} \)
(c) \( 4.5 \mathrm{~s} \)
(d) \( 6.0 \mathrm{~s} \)
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