Q .     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 coefficients of linear, expansion for aluminium and steel are `α_a` and `α_s` respectively. If the length of each rod increases by the same amount when their temperature are raised by `t°C`, then find the ratio` (l_1)/(l_1+l_2)` (2003, 2M)

JEE 2003 Prelims
A

`(α_a)/(α_s)`

B

`(α_s)/((α_a+α_s))`

C

`(α_s)/(α_a)`

D

`(α_a)/((α_a-α_s))`

HINT

`Δl_1 = Δl_2`

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