A metal bar of length / is covered with some non-conducting material to prevent heat losses from its surface and the two ends are maintained at steady temperatures ${\mathrm{\theta }}_1 \mathrm{and} {\mathrm{\theta }}_2(<{\mathrm{\theta }}_1)$. In the steady state, the temperature $\mathrm{\theta }$ of the bar above the surrounding at distance x from the hot end varies as shown in the graph:

• A

  

• B

  

• C

  

• D