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Q.

A bar of iron of length 1 m and 1 cm2 cross-section is heated from 0 °C to 100°C. The coefficient of linear expansion of iron is 10-5 l°C. The increase in its length is:

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a

1 cm

b

0.1 cm

c

0.01 cm

d

0.001 cm

answer is B.

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Detailed Solution

Thermal strain ∆ll=α∆θ ⇒∆l=α∆θl=10-5×100×1 =10-3m=0.1 cm

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A bar of iron of length 1 m and 1 cm2 cross-section is heated from 0 °C to 100°C. The coefficient of linear expansion of iron is 10-5 l°C. The increase in its length is: