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Two diagonally opposite corners of a squ...

Two diagonally opposite corners of a square made of a four thin rods of same material, same dimensions are at temperature `40^(@)C` and `10^(@)C`. If only heat conduction takes place, then the temperature difference between other two corners will be

A

`0^(@)C`

B

`10^(@)C`

C

`25^(@)C`

D

`15^(@)C`

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