Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of 2:1. The ends are maintained at temperatures θA and θB as shown with θA>θB and sides are thermally insulated. Which of the following graph represents temperature gradient (dTdx) against x in steady state.

Two rods of same length and cross-sectional area are joined in series.

1.	Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of 2:1. The ends are maintained at temperatures θA and θB as shown with θA>θB and sides are thermally insulated. Which of the following graph represents temperature gradient (dTdx) against x in steady state.
Answer» Two rods of same length and cross-sectional area are joined in series. Thermal conductivity of the rods are in ratio of $2 : 1$ . The ends are maintained at temperatures $θ_{A}$ and $θ_{B}$ as shown with $θ_{A} > θ_{B}$ and sides are thermally insulated. Which of the following graph represents temperature gradient $(\frac{d T}{d x})$ against $x$ in steady state.