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

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