A copper rod 2 m long has a circular cross-section of radius  1 cm. One end
Channel: Doubtnut
Date: 2020-07-12

A copper rod 2 m long has a circular cross-section of radius  1 cm. One end is kept at `100^@C` and the other at `0^@C`. The surface is insulated so that negligible heat is lost through the surface. In steady state, find  (a) the thermal resistance of the bar  (b) the thermal current H  (c) the temperature gradient `(dT)/(dx)` and  (d) the temperature at a distance 25 cm from the hot end.  Thermal conductivity of copper is 401 `W//m-K.`