If K_1 and K_2 are the thermal conductivities, L_1 and L_2 are the lengths and A_1 and A_2 are the cross sectional areas of steel and copper rods…

If $\displaystyle K_1$ and $\displaystyle K_2$ are the thermal conductivities, $\displaystyle L_1$ and $\displaystyle L_2$ are the lengths and $\displaystyle A_1$ and $\displaystyle A_2$ are the cross sectional areas of steel and copper rods respectively such that $\displaystyle \frac{K_2}{K_1}=9, \frac{A_1}{A_2}=2, \frac{L_1}{L_2}=2$. Then, for the arrangement as shown in the figure, the value of temperature T of the steel - copper junction in the steady state will be :