A rod of initial length 2m at a temperature of 25°C is heated to 80°C. Calculate the increase in the length of the rod if its linear expansivity is 4.0 x 10‾³K‾¹

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A. 0.26m
B. 0.44m
C. 0.53m
D. 0.84m

Correct Answer: Option B

B. 0.44m

Explanation

l2−l1=αl1(θ2−θ1)=4.0×10‾³ × 2 (80−25)

= 0.44m

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