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Q.

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 tempera – tures, which one of the following relations holds good ?

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a

α1l2=α2l1

b

α1l22=α2l12

c

α12l1 =α22l2

d

α1l1=α2l2

answer is D.

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