A compound rod is formed of a steel core of diameter `1cm` and outer casing is of copper, whose outer diameter is `2cm`. The length of this compound rod is `2m` and one end is maintained as `100^(@)C` and the end is at `0^(@)C`. If the outer surface of the rod is thermally insulated, then heat current in the rod will be (Given thermal conductivity of steel `j=12cal//m//k//s`, thermal conductivity of copper `=92cal//m//k//s`

Answer

`[(a)1.13 cal S^(-1)`
(b) `96%`]