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

Area $\propto {(length)}^{2}$
percentage increase in area = 2 $\times$ percentage increase in length for a solid.

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