Q.

A copper rod is joined to a steel rod in series. The rods have equal length and equal cross – sectional area. The free end of copper rod is kept at 10°C and that of steel rod is kept at 100°C. If the thermal conductivity of copper is eight times that of steel, what is the temperature at the junction of the rods ?

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By Expert Faculty of Sri Chaitanya

50°C

26°C

20°C

11°C

answer is 3.

(Detailed Solution Below)

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Detailed Solution

when they are connected in series heat flow Qt= KAT1-T2l= constant Temperature difference is inversely proportional to K 100-TT-10=K2K1=81 solving T=20

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