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Q.

A thin copper wire of length L expands in length by 0.2% when it is heated from 00C to 500C. If a copper plate of area 2L×L4 is heated from 00C to 1000C. The % increase in its area is

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a

0.2 %

b

0.4 %

c

0.8 %

d

1 %

answer is C.

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Detailed Solution

α Δt1=ΔllΔAA=2α Δt2=4α Δt1ΔAA×100=4×Δll×100⇒4×0.2=0.8%
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