Suppose there is a hole in a copper plate. On heating the plate, diameter of hole, would

  • A

    always increase

  • B

    always decrease

  • C

    always remain the same

  • D

    none of these

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Given below are two statement : one is labelled as Assertion $A$ and the other is labelled as Reason $R$.

Assertion $A$ : When a rod lying freely is heated, no thermal stress is developed in it.

Reason $R :$ On heating the length of the rod increases.

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  • [JEE MAIN 2021]

The coefficient of linear expansion of crystal in one direction is ${\alpha _1}$ and that in every direction perpendicular to it is ${\alpha _2}$. The coefficient of cubical expansion is