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  4. If the length of a cylinder on heating increases by 2 %, the area of its base will increase by

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Q. If the length of a cylinder on heating increases by $2 \%$, the area of its base will increase by

Thermal Properties of Matter

Solution:

$\frac{\Delta A}{A}=2 \cdot \frac{\Delta L}{L}$
$\Rightarrow \frac{\Delta A}{A}=2 \times 2=4 \%.$