The coefficient of linear expansion of brass and steel are α1 and α2. If we take a brass rod of length l1 and steel rod of length l2at0∘C, their difference in length (l2−l1)will remain the same at a temperature if
A
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B
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C
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D
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Solution
The correct option is D d)L2=l2(l+α2△θ) and L1=l1(l+α1△θ) ⇒(L2−L1)=(l2−l1)+△θ(l2α2−l1α1) Now (L2−L1)=(l2−l1) so, l2α2−l1α1=0