First slide

Thermal expansion

Question

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

Easy

A

Should be heated
B

Should be cooled
C

May be heated or cooled
D

Cannot be removed by heating or cooling

Solution

$α_{b r a s s} > α_{s t e e l}$ . System must be heated which causes more expansion in brass disc and less expansion in the hole of steel plate.

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