A rod of lengh l with thermally insulated lateral surface consists of material whose heat conductivity coefficient varies with temperature as x=alpha//T, where alpha is a constant. The end of the rod are kept at temperature T_(1) and T_(2). Find the heat flow density.

A rod of lengh l with thermally insulated lateral surface consists of

1.	A rod of lengh l with thermally insulated lateral surface consists of material whose heat conductivity coefficient varies with temperature as x=alpha//T, where alpha is a constant. The end of the rod are kept at temperature T_(1) and T_(2). Find the heat flow density.
Answer» `(ALPHA)/(l)log_(E)((T_(1))/(T_(2)))` `(alpha)/(l)log_(e)((T_(2))/(T_(1)))` `(alpha)/(l)log_(e)((T_(1)+T_(2))/(T_(1)))` `(alpha)/(l)log_(e)((T_(1))/(T_(1)+T_(2)))` Answer :B