Thermal expansion
Two identical circular holes are made in a metallic square sheet, and two tiny points and are marked next to the holes, as shown in the diagram.
If the temperature of the whole sheet is uniformly raised, then the size of the holes will and the distance between and will
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Case 1 : When the sheet is completely plane with no holes.
In this case when heat is supplied to the sheet the intermolecular spacing increases due to high kinectic energy possessed by the molecules which only expands in outward direction increasing the size of sheet.
Case 2 : When the sheet is created with holes and point A and B marked as per problem.
Regarding this case the sheet will follow the same nature of Case 1 resulting the increase in the size of holes . Moreover, the the molecules around the holes created will expand inward direction where inward expansion is lesser than outward expansion resulting the bi-directional (inward and outward ) expansion of sheet which further gives increase in the distance between two point A and B.