Length of each rail at 20°C is 10m. Maximum temperature in summer is 40°C. At 20°C, if the gap left between the two successive rails is 0.22cm, coefficient of linear expansion of rail material is
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Gap left = Change in length on heating
Gap=Initial length×Coefficient of linear expansion×change in temperature
Gap=10×0.000012×15m
⟹Gap=0.0018 m
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