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 × 10 - 6 ° C - 1 , then increase in the length of bar (in cm ) is

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 × 10 - 6 ° C - 1 , then increase in the length of bar (in cm ) is, 0 . 5 cm, 1 . 0 cm, 1 . 5 cm, 2 . 0 cm

MARKS App · Accepted Answer

The change in length ∆ l is proportional to l and ∆ T . Stated mathematically as ∆ l = α l ∆ T Where α is called the coefficient of linear thermal expansion for the material. Given: ∆ T = 100 ° C l = 10 m ∴ ∆ l = 10 × 100 × 10 × 10 - 6 = 10 - 2 m = 1 cm

Search any question & find its solution

Looking for more such questions to practice?