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Thermal Expansion

A brass disc ...

Question

A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the system

A

first heated then cooled.

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B

first cooled then heated.

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C

is heated

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D

is cooled

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Solution

The correct option is D is cooled
A brass disc fits simply in a hole of a steel plate. The disc from the hole can be loosened if the system is cooled. Since, the coefficient of linear expansion of brass is greater than that of steel.
On cooling, the brass contracts more, so, it get loosened.

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