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Grade: 11
        
A metal sheet having two circular holes is cooled the distance between the centres of the holes 
9 months ago

Answers : (2)

Arun
23828 Points
							
Dear student
 
Either question is incomplete or options are missing. so please attach an image or repost the question with options. I will be happy to help you.
9 months ago
Khimraj
3008 Points
							
Diameter of hole will increase.

This is a classic question. Many of us "expect" that diameter of hole will decrease, because plate is free to expand in that direction as well. Note that expansion of metal due to heating is not like gas spreading out wherever space is available.

Correct way to think about it is following. Hole size is irrelevant in this case. So we can think that hole is very large. If we carve hole so large such that it's radius is slightly less than that of plate itself, then we will have a ring. It is obvious that radius of ring will increase, as atoms have more energy so there oscillation amplitude will increase. As diameter of ring increases, diameter of hole will also increase.
7 months ago
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  • NCERT Solutions
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