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JEE PHYSICS MCQ: THERMAL PROPERTIES OF MATTER

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An anisotropic substance has coefficients of linear thermal expansions α1,  α2,  α3{\alpha_1},\,\,{\alpha_2},\,\,{\alpha_3} along x, y, z axes respectively. Coefficient of cubical expansion of its material is
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Correct option: A
α1+α2+α3{\alpha_1} + {\alpha_2} + {\alpha_3}
Option A (α1+α2+α3{\alpha_1} + {\alpha_2} + {\alpha_3}) is correct because the coefficient of cubical expansion is the sum of the linear expansion coefficients along the three axes in an anisotropic substance.

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