A copper rod of length 75 cm and an iron...

A copper rod of length 75 cm and an iron rod of length 125cm are joined together end to end . Both are of circular cross section with diameter 2 cm . The free ends of the copper and iron are maintained at `100^@C` and`0^@C` respectively . The surface of the bars are insulated thermally . The temperature of the copper -iron junction is [Thermal conductivity of the copper is `386.4 W//m-K ` and that of iron is `48.46W//m-K`].

`100^@C`

`0^@C`

`93^@C`

`50^@C`

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