Consider two thin rods of identical shape and size one made

Consider two thin rods of identical shape and size, one made of wood and the other made of copper. The two rods are glued to each other at one end to create a composite rod of double the length. The free ends of the wood and copper rods are maintained at a temperature of 20 °C, whereas the point where the rods are glued is heated up using a candle. Once the composite rod reaches steady-state, which one of the two (wood or copper) will on average be hotter than the other

Solution

Copper will be cooler as compared to the wood as its thermal conductivity is much higher than that of the wood.

Also, wood will take much longer to reach to a steady state.