A cuboid ABCDEFGH is anisotropic with alpha_x | vedclass

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(C) For an anisotropic material,the coefficient of superficial expansion $\beta$ for a face is the sum of the linear expansion coefficients along the

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$\beta_{CDEH} = 3 	imes 10^{-5} /^{\circ}C$

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(C) For an anisotropic material,the coefficient of superficial expansion $\beta$ for a face is the sum of the linear expansion coefficients along the two axes defining that face.Given: $\alpha_x = 1 	imes 10^{-5} /^{\circ}C$,$\alpha_y = 2 	imes 10^{-5} /^{\circ}C$,$\alpha_z = 3 	imes 10^{-5} /^{\circ}C$.From the figure,face $CDEH$ lies in the $xy$-plane (assuming $D$ is at origin or aligned with axes as per standard orientation).Specifically,face $CDEH$ is defined by the $x$ and $y$ axes.Therefore,$\beta_{CDEH} = \alpha_x + \alpha_y = (1 + 2) 	imes 10^{-5} /^{\circ}C = 3 	imes 10^{-5} /^{\circ}C$.Thus,option $C$ is correct.

$A$ cuboid $ABCDEFGH$ is anisotropic with $\alpha_x = 1 \times 10^{-5} /^{\circ}C$,$\alpha_y = 2 \times 10^{-5} /^{\circ}C$,$\alpha_z = 3 \times 10^{-5} /^{\circ}C$. The coefficient of superficial expansion of the faces can be:

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