Two rods of different materials will have same different in lengths at all temperatures if they have same expansions then , given(α1,α2 are coefficient of linear expansions; l1,l2 are lengths of rods)

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l2α2=l2α1

l1α1=l2α2

l1α1>l2α2

l1α2

answer is B.

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Detailed Solution

given ∆l1=∆l2 (difference in lengths is same) ⇒l1α1∆t=l2α2∆t ( given at all temperature) ⇒l1α1=l2α2

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