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The ends of a metre stick are maintain a...

The ends of a metre stick are maintain at `100^(@)C` and `0^(@)C` . One end of a rod is maintained `25^(@)C` . Where should its other end be touched on the metre stick so that there is no heat current in the rod in steady state?

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The correct Answer is:
B, C, D
Let the point to be touched be B No Heat will flow when the temperature at that point is also`25^(@)C`
that means
`So, (kA(100-25))/(100-x)=(kA(25-0))/(x)`
implies 75x=2500-25x`
`implies100x=2500`
`x=25 cm`
From the end with `0^(@)C `.
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