The length of each steel rail of a line ...

The length of each steel rail of a line at `10^(@)C` is 25 m. What gap should be maintained between two successive rails so that up to `50^(@)C` they will not be strained? [coefficient of linear expansion of steel `=11 times 10^(-6@)C^(-1)`]

5.5 mm

8.25 mm

11 mm

1.65 mm

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