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A thin copper wire of length l metre inc...

A thin copper wire of length `l` metre increases in length by `2%` when heated through `10^(@)C`. What is the percentage increase in area when a square copper sheet of length `l` metre is heated through `10^(@)C`

A

`4%`

B

`8%`

C

`16%`

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
A
`((Deltal)/l) xx100 =2%` area (A) =`l^2`
`implies ((DeltaA)/A) xx100 =2 ((Deltal)/(l) xx100) =4%`
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