Figure shows a horizontal cross section (top view) of a square room surrounded on four sides by thick walls. The walls are all made of the same material and all have the same face area. They have thickness of either L, 2L or 3L as shown, and they are maintained at `5^@C`, and the conduction of energy outward through the walls is steady. H be heat current through walls.`((Delta T)/(Delta x))` be the temperature gradient across the wall, then

Options

A. `((Delta T)/(Delta X))_A=(Delta T) /(Delta X)_B=((Delta T)/(Delta X)_C gt ((Delta T)/(Delta X))_D`
B. `H_A=H_B=B_C gt H_D`
C. `((Delta T)/(Delta X))_A lt ((Delta T)/(Delta X))_B lt ((Delta T)/(Delta X))_C=((Delta T)/(Delta X))_D`
D. `H_A=H_B lt H_C gt H_D`

Answer

A, B