First slide

Thermal expansion

Question

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

Easy

A

0.5%
B

2%
C

1%
D

4%

Solution

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

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