$[2](10$ Points$)$

An infinitive long fin is inserted into a wall with insulation. The fin's cross section is a square with the dimension of axa. The fin's conductivity is K$.$ The part of the fin that is insulated has the length of $L.$ The fin is subject to heat transfer coefficient of $h$ at ambient temperature of $T_c.$ Calculate the the fin's base temperature $T_b$ and the temperature $T_0,$ where heat of $Q$ is inserted to the fin.