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Two identical rectangular rods of metal ...

Two identical rectangular rods of metal are welded end to end in series between temperature `0^(@)C` and `100^(@)C and 10 J` of heat is conducted (in steady state process) through the rod in `2.00 min.` if `5` such rods are taken and joinded as shown in figure maintaining the same temperature difference between A and B, then the time in which `20 J` heat will flow through the rods is

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