There are two rods of length `l_1` `l_2` and coefficient of linear expansions are `alpha_1` and `alpha_2` respectively.
Find equivalent coefficient of thermal expansion for their combination in series.

There are two rods of length l_1 and l_2 and coefficient of linear expansions are alpha_1 and alpha_2 respectively. Find equivalent coefficient of thermal expansion for their combination in series.

Two metallic rods of length l and 3l have coefficient of linear expansion alpha and 3alpha respectively. The coefficient of linear expansion ofr their series combinations, is

Two metallic rods of length l and 3l have coefficient of linear expansion alpha and 3alpha respectively. The coefficient of linear expansion ofr their series combinations, is

Two rods of lengths L_(1) and L_(2) are welded together to make a composite rod of length (L_(1)+L_(2)) . If the coefficient of linear expansion of the materials of the rod are alpha_(1) and alpha_(2) respectively. The effective coefficient of linear expansion of the composite rod is

Two rods having length l_1 and l_2 , made of materials with the linear expansion coefficient alpha_1 and alpha_2 , were soldered together. The equivalent coefficient of linear expansion for the obtained rod is