Assertion :- A brass disc is fast fitted in a | vedclass

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(A) The coefficient of linear expansion of brass $(\alpha_b)$ is approximately $19 	imes 10^{-6} /^{\circ}C$,while that of steel $(\alpha_s)$ is appr

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Both Assertion and Reason are true and Reason is the correct explanation of Assertion.

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(A) The coefficient of linear expansion of brass $(\alpha_b)$ is approximately $19 	imes 10^{-6} /^{\circ}C$,while that of steel $(\alpha_s)$ is approximately $12 	imes 10^{-6} /^{\circ}C$.Since $\alpha_b > \alpha_s$,brass expands or contracts more than steel for the same change in temperature.To loosen the brass disc from the steel plate,the disc must shrink more than the hole in the steel plate.Cooling the system causes both to contract,but because the brass disc contracts more than the steel hole,the disc will become loose.Therefore,both the Assertion and the Reason are true,and the Reason correctly explains the Assertion.

Assertion :- $A$ brass disc is fast fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole.
Reason :- The coefficient of linear expansion of brass is greater than the coefficient of linear expansion of steel.

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Assertion :- $A$ brass disc is fast fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole.Reason :- The coefficient of linear expansion of brass is greater than the coefficient of linear expansion of steel.