which one of the following relations holds good?

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Coefficient of linear expansion of brass and steel rods are α1​ and α2​. Lengths of brass and steel rods are l1​ and l2​ respectively. If (l2 ​− l1​) is maintained same at all temperatures, which one of the following relations holds good?
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Aug
Coefficient of linear expansion of brass and steel rods are α1​ and α2​. Lengths of brass and steel rods are l1​ and l2​ respectively. If (l2 ​− l1​) is maintained same at all temperatures, which one of the following relations holds good? Coefficient of linear expansion of brass and steel rods are α1​ and α2​. [...]
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Tags: Coefficient of linear expansion of brass and steel rods are α1​ and α2​. Lengths of brass and steel rods are l1​ and l2​ respectively. If (l2 ​− l1​) is maintained same at all temperatures , which one of the following relations holds good? ,