A metal rod of length 50cm is heated from 40oC to 80oC. If the linear expansivity of the material is α, calculate the increase in length of the rod (in metres) in terms of α.

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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

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