question_answer

Two rods of the same length and areas of cross- section \[{{A}_{1}}\] and \[{{A}_{2}}\] have their ends at the same temperature \[{{K}_{1}}\] and \[{{K}_{2}}\] are the thermal conductivities of the two rods. The rate of flow of heat is same in both rods if

A) \[\frac{{{A}_{1}}}{{{A}_{2}}}=\frac{{{K}_{1}}}{{{K}_{2}}}\]         

B)        \[\frac{{{A}_{1}}}{{{A}_{2}}}=\frac{{{K}_{2}}}{{{K}_{1}}}\]

C) \[{{A}_{1}}{{A}_{2}}={{K}_{1}}{{K}_{2}}\]

D)        \[{{A}_{1}}{{K}_{1}}^{2}={{A}_{2}}{{K}_{2}}^{2}\]