A long hollow cylinder of inner and outer radii $r_1$ and $r_2$ and length $L$ has its inner surface subjected to a uniform heat flux at a rate of $q_i^{\text{'}\text{'}}(\frac{W}{m^2}),$ while the outer surface is in contact with atmospheric pressure, there is no internal heat generation in the cylinder. Derive an expression for steady state radial temperature, Further calculate the temperature of the inner surface of the cylinder. If $r_1=10cm,r_2=20cm,k=50\frac{W}{m}K$ and $q_i^{\text{'}\text{'}}={1\mathrm{.}16}^{**}{10}^5\frac{W}{m^2},$