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Q.

A copper wire of length ‘l’ increases in length by 0.2% on heating from 200C to 400C. Then percentage change in area of a copper plate of dimensions 4l×3l on heating from 200C to 400C is

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a

0.4 %

b

0.2 %

c

0.6 %

d

0.1 %

answer is C.

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Detailed Solution

A=4l×3l

ΔAA=2Δll=2×0.2%=0.4%

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