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Standard XII

Physics

Thermal Expansion

A metallic ba...

Question

A metallic bar is heated from $0^{0}$ C to $100^{0}$ C. The coefficient of linear expansion is $10^{- 5} K^{- 1}$ . What will be the percentage increase in length ?

0.01%

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0.1%

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10%

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Solution

The correct option is A 0.1%
$\frac{Δ l}{l} = α Δ T = 10^{- 5} \times 100 = 10^{- 3}$
$\frac{Δ l}{l} \times 100$ % $= 10^{- 3} \times 100$
$= 10^{- 1} = 0.1$ %

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A metallic bar is heated from 00C to 1000C. The coefficient of linear expansion is 10−5K−1. What will be the percentage increase in length ?

The correct option is A 0.1%Δll=αΔT=10−5×100=10−3Δll×100% =10−3×100=10−1=0.1%

A metallic bar is heated from $0^{0}$ C to $100^{0}$ C. The coefficient of linear expansion is $10^{- 5} K^{- 1}$ . What will be the percentage increase in length ?

The correct option is A 0.1%
$\frac{Δ l}{l} = α Δ T = 10^{- 5} \times 100 = 10^{- 3}$
$\frac{Δ l}{l} \times 100$ % $= 10^{- 3} \times 100$
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