A bar of Cu of length 75 cm and a steel bar of 125 cm length are joined together end to end. Both the bars are having same diameter of 2 cm. The free ends of the Cu and the steel bars are maintained at 100°C and 0°C respectively. The curved surfaces of the bars are thermally insulated, what is the approximate temperature at Cu-steel junction? (consider conductivity k of Cu = 400 Js-1m-1 C-1 and k for steel 50 Js-1m-1 C-1)

A bar of Cu of length 75 cm and a steel bar of 125 cm length are joine

1.	A bar of Cu of length 75 cm and a steel bar of 125 cm length are joined together end to end. Both the bars are having same diameter of 2 cm. The free ends of the Cu and the steel bars are maintained at 100°C and 0°C respectively. The curved surfaces of the bars are thermally insulated, what is the approximate temperature at Cu-steel junction? (consider conductivity k of Cu = 400 Js-1m-1 C-1 and k for steel 50 Js-1m-1 C-1)
A.	95°C
B.	93°C
C.	90°C
D.	89°C
Answer» C. 90°C

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