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Note: This problem has dynamic elements. This means elements such as numbers and consequently the step-by-step solution and the final answer may change overtime. Therefore, there may be a difference between a problem that is published online and the same problem exported into a PDF document.
The iron rod shrinks by .
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change if it cools by 
?
. This means that each metre of iron rail extends by 0.012 mm when heated by 1 K .
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