A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC….

A rod of initial lenght 2m at a temperature of 25oC is heated to 80oC. Calculate the increase in 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
Explanation

(l_2 – l_1 = alpha l_1 (theta_2 – theta_1) = 4.0 times 10^{-3} times 2(80 – 25))
= 0.44m

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