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A cylindrical steel rod of length 0.10 m and thermal conductivity 50 W.m–1 K–1 is welded end to end to copper
rod of thermal conductivity 400 W.m–1. K–1 and of the same area of cross section but 0.20 m long. The free end of
the steel rod is maintained at 100º C and that of the copper and at 0º C. Assuming that the rods are perfectly
insulated from the surrounding, the temperature at the junction of the two rods

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