A thin copper wire of length l metre increases in length by 2% when heated through 10^o C . ...

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1.Units, Dimensions and Measurement

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

A

$4$

B

$8$

C

$16$

D

None of the above

Solution

(a) Since percentage increase in length $= 2 \%$

Hence, percentage increase in area of square sheet $ = 2 \times 2\% $ $= 4\%$

Standard 11

Physics

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