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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)/(26alpha)`

B

`(x)/(13alpha)`

C

`(2x)/(13alpha)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
B
`l=x=lmuT`
`l=(x)/(13alpha)`
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