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Question

A thin copper wire of length l increases its length by 1% when heated from temperature T1 to T2. What is the percentage change in area when a thin copper plate having dimensions 2l×l is heated from T1 to T2?


A

1%

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B

2%

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C

3%

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D

4%

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Solution

The correct option is B

2%


We know that, Δl=αlΔT
1100l=αl(T2T1)
α(T2T1)=0.01
Now, coefficient of area expansion, β=2α
So, increase in area, ΔA=βAΔT=2αA(T2T1)
ΔAA=2α(T2T1)=0.02
Hence, percentage increase in area is 2% and the correct option is (b).


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