Question

An iron bar of length 10 m is heated from 0°C to 100°C. If the coefficient of linear thermal expansion of iron is 10 X 10^-6 / °C , the increase in the length of bar is
(a) 0.5 cm (b) 1.0 cm (c) 1.5 cm (d) 2.0 cm
​

Answer 1

Answer:

The linear thermal expansion of an object can be expressed as

Δl=l

0

α(T−T

0

)

where Δl= change in length of the object, l

0

= initial length, α= coefficient of linear thermal expansion, T= final temperature and T

0

= initial temperature.

So, Δ=10(10×10

−6

)(100−0)=10

−2

m=1cm