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Question

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 l2 at 0C, their difference in length (l2l1)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+α2θ) and L1=l1(l+α1θ)
(L2L1)=(l2l1)+θ(l2α2l1α1)
Now (L2L1)=(l2l1) so, l2α2l1α1=0

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