First slide

Thermal expansion

Question

A piece of copper wire has a length of 2m at 10°C. Its length at 100°C is (Coefficient of linear expansion of copper = 17×10^-6/°C)

Easy

A

20.00306 m
B

200.306 m
C

2.00306 m
D

15.000306m

Solution

We have $\large l_2=l_1[1+\alpha(t_2-t_1)]$
$\large =2[1+(17\times 10^{-6})(90)]=2(1.00153)=2.00306m$

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