First slide

Thermal expansion

Question

A wire of length 100cm increases in length by 10^-2 m when it is heated through 100°C. The coefficient of linear expansion of the material
of the wire expressed in /K units is

Moderate

A

-1 × 10^-6
B

1 × 10⁴
C

1 × 10^-4
D

10^-2

Solution

$a = \frac{l_{2} - l_{1}}{l_{1} (t_{2} - t_{1})}$

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