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Q.

A metallic bar is heated from 0ºC to 100ºC. The coefficient of linear expansion is 10–5 K–1. What will be the percentage increase in length

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a

0.01%

b

0.1%

c

1%

d

10%

answer is B.

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Detailed Solution

ℓ2−ℓ1ℓ1=αΔT⇒ℓ2−ℓ1ℓ1×100%=10−5×102×102 %=0.1%
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A metallic bar is heated from 0ºC to 100ºC. The coefficient of linear expansion is 10–5 K–1. What will be the percentage increase in length