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A steel stopper snuggly fits in the hole of brass plate. To remove the stopper easily, the system

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Should be cooled.

May be heated or cooled.

Cannot be removed by heating or cooling.

Should be heated.

answer is A.

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Detailed Solution

$α_{brass} > α_{steel}$ . System must be heated which causes more expansion in brass plate and less expansion in the steel stopper.

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