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$\_$infinity. Calculate the the fin's base temperature T$\_$b and the temperature T$\_0,$ where heat of Q is inserted to the fin.