CAPE Physics Unit 1 · 2008 (T&T) · Paper 1 · Question Q38

The composite bar shown below has a uniform cross-sectional area and is composed of 2 uniform bars, A and B, of the same length placed in good thermal contact. The rod is well lagged and the ends are maintained at temperatures \theta_2 and \theta_1 (where \theta_2 > \theta_1 > \text{room temperature}). The thermal conductivity of A is greater than that of B and the rod is in steady state. Which of the following graphs represents the variation of temperature (\theta) with distance (x) along the rod?

1. (A)[diagram option — open in Quelpr]
2. (B)[diagram option — open in Quelpr]
3. (C)[diagram option — open in Quelpr]
4. (D)[diagram option — open in Quelpr]

This question uses a figure or table from the paper — you'll see it when you practise.