Three different arrangemnets of matrials `1` and `2,3` to from a wall Thremal conductivities are `k_(1) gt k_(2) gt k_(3)` The left side of the wall is `20^(@)C` higher than the right side Temperature difference `DeltaT` across the material 1 has following relation in three cases

Options

A. `DeltaT_(a) gt Deltab+_(b) gtdeltaT_(c)`
B. `DeltaT_(c) = DeltaT_(b) =DeltaT_(c)`
C. `DeltaT_(a) =DeltaT_(b) gt DeltaT_(c)`
D. `DeltaT_(a) =DeltaT_(b) lt DeltaT_(c)`

Answer

B

Explanation

since the rate of heat flow will be same in all the three cases so the temperature diffrence will also be same across wall 1 because it has same parameteres in all the cases .