d and f-Block ElementsHard

Question

Two rectangular blocks, having identical dimensions, can be arranged either in configuration I or in configuration II as shown in the figure. One of the blocks has thermal conductivity k and the other 2k. The temperature difference between the ends along the x-axis is the same in both the configurations. It takes 9s 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 :-

                

Options

A.2.0 s
B.3.0 s
C.4.5 s
D.6.0 s

Solution


            ;       
in configuration 1      ;       equivalent R = 3R
in configuration 2      ;       equivalent
               ;       

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