A. 20α
B. 200α
C. 2000α
D. 20000α
Correct Answer: Option A
A. 20α
Explanation
L2−L1=α1(θ2−θ1)=α×0.5×40=20α
![A metal rod of length 100cm is heated through 100°C, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10^-6K-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "A metal rod of length 100cm is heated through 100°C, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10^-6K-1]")
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