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Two rods one of aluminium and the ot...

Two rods one of aluminium and the other made of steel having initial length `l_(1)` and `l_(2)` are connected together to form a single rod of length `l_(1) + l_(2)` . The co - efficient of linear expansion for aluminium steel are `a_(a)` and `alpha_(a)` respectively . If the length of each rod increases by ghe same amount when their temeperature are raised by `+ .^(@)C` then find the ratio `(l_(1))/(l_(1)+ l_(2))`

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