A thin copper wire of length $l$ metre increases in length by 2% when heated through ${10^{\rm{o}}}C.$. What is the percentage increase in area when a square copper sheet of length l metre is heated through ${10^{\rm{o}}}C.$

JEE PHYSICS MCQ: UNITS & MEASUREMENTS

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A thin copper wire of length

l

metre increases in length by 2% when heated through

{10^\mathrm{o}}C.

. What is the percentage increase in area when a square copper sheet of length l metre is heated through

{10^\mathrm{o}}C.

View answer and explanation

Correct option: A

4\%

Option A (4%) is correct because the percentage increase in area is twice the percentage increase in length.

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