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For an isotropic solid,if alpha(x),alpha...

For an isotropic solid,if `alpha_(x)`,`alpha_(y)`,`alpha_(z) ` represent the mean coefficient of linear expansion along three mutually perpendicular directions then coefficient of volumetric expansion can be written as, A) `sqrt(alpha_(x)alpha_(y)alpha_(z))` B) `alpha_(x)+alpha_(y)+alpha_(z)` C) `alpha_(x)alpha_(y)+alpha_(y)alpha_(z)+alpha_(z)alpha_(x)` D) `alpha_(x)alpha_(y)alpha_(z)`

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