Circular fins of uniform cross section, with diameter of 10 mm and length of 50 mm, are attached to a wall with surface tem perature of 350°c. the fins are made of material with thermal conductivity of 240 w/m k, and they are exposed to an ambient air condition of 25°c and the convection heat transfer coefficient is 250 w/m2-k. determine the temperature at the middle of the fin for infinitely long fin.