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The gap between any two rails each of le...


The gap between any two rails each of length l laid on a railway trach equals x at `27^@C` When the temperature rises to `40^@C` the gap closes up. The coefficient of linear expansion of the material of the rail is `alpha`. The length of a rail at `27^@C` will be

A

`(x)/( 2 b alpha)`

B

`( x)/( 13 alpha)`

C

`( 2x)/( 13 alpha) `

D

None

Text Solution

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The correct Answer is:
B
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