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Two rods of lengths L(1) and L(2) are we...

Two rods of lengths `L_(1)` and `L_(2)` are welded together to make a compsite 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. Tge effecitive coefficient of linear expansion of the composite rod is

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