Correct Answer: Option C

Explanation

The increase in length of the steel rail is given by
= α 10
= 11 x 10^-6 x 20 x (40 -20)
= 11 x 10^-6 x 20 x 20
= 4.4 x 10^-3
∴ Final length will be original length plus increase in length
= 20 + 4.4 x 10^-3
= 20 + 0.0044
= 20.0044m

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