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The average value of $' α'$ for an anisotropic solid is

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α=α1+α2+α32

α=α1+α2+α34

α=α1+α2+α35

α=α1+α2+α33

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Correct option is D

when coefficient of linear expansion is different for 3 different mutually perpendicular directions of solid then their average value is considered

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The average value of 'α' for an anisotropic solid is

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The average value of $' α'$ for an anisotropic solid is