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Two cylinders P and Q have the same leng...

Two cylinders P and Q have the same length and diameter and are made of different materials having thermal conductivities in the ratio `2 : 3`. These two cyinders ar combined to make a cylinder. One end of P is kept at `100^(@)C` and another end of Q at `0^(@)C`. THe temperature at the interface of P and Q is

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`40^(@)`C
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