Question

Select One Correct Option from the following: Two rods, one of aluminium and the other made of steel, having initial lengths $l_1 and l_2$ are connected together to form a single rod of length $l_1+l_2$.The coefficients of linear expansion for aluminium and steel are $\alpha_a \ and \ \alpha_s$ respectively. If the length of each rod increases by the same amount when their temperature are raised by $\frac{l_1}{l_1+l_2}$.
A) $\frac{\alpha_s}{\alpha_a}$.
B) $\frac{\alpha_a}{\alpha_s}$.
C) $\frac{\alpha_s}{\alpha_a+\alpha_s}$.
D) $\frac{\alpha_a}{\alpha_a+\alpha_s}$.

Answer 1

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