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Q.

A composite rod made of copper (α = 1.8 x 10-5 K-1) and steel (α = 1.2 x 10-5 K-1) is heated, then it:

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a

bends with steel on concave side

b

bends with copper on concave side

c

does not expand

d

data is insufficient

answer is A.

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Detailed Solution

As αcopper>αsteel,the composite rod bends with steel on concave side when heated.
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A composite rod made of copper (α = 1.8 x 10-5 K-1) and steel (α = 1.2 x 10-5 K-1) is heated, then it: