First slide

Thermal expansion

Question

The coefficient of linear expansion of a metal is 1×10^-5/°C. The percentage increase in area of a square plate of that metal when it is heated through 100°C is

Moderate

A

0.02%
B

0.1%
C

0.001%
D

0.2%

Solution

$b = 2 a, \frac{ΔA}{A} 100 = bΔ 100$

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