Two metal rods 1 and 2 of the same length have same temperature difference between their ends. Their thermal conductivities are `K_1 and K_2` and cross-section areas `A_1 and A_2` respectively. What is the required condition for the same rate of heat conduction in them?

Options

A. `K_(1)A_(2) = K_(2)A_(1)`
B. `K_(1)A_(2) = K_(2)^(2)A_(1)`
C. `K_(1)A_(1) = K_(2)A_(2)`
D. `K_(1)A_(1)^(2) = K_(2)A_(2)^(2)`

Answer

C

Explanation

`Q//t = KA (T_(1)-T_(2)//d)` The rate of heat flow will be same when `K_(1)A_(1) =K_(2)A_(2)`.