A brass disc fits into a hole in an iron plate. To remove the disc
A
the plate must be cooled
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B
the plate must be heated
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C
the plate may be heated (or) cooled
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D
the disc must be heated
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Solution
The correct option is B the plate must be cooled On cooling, the brass disc, owing to greater coefficeint of expansion, would contract more than the iron plate thus making it easier to remove it