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Two uniform metal rods of length L1 and L2 and their linear coefficients of expansion α1 and α2 respectively, are connected to form a single rod of length (L1+L2). When the temperature of the combined rod is raised by "t°C", the length of each rod increased by the same amount then \large \left [ \frac {\alpha_2}{\alpha_1+\alpha_2} \right ] is

a
b
c
d

detailed solution

Correct option is A

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