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Question

A cuboid ABCDEFGH is anisotropic with αx=1×105/C,αy=2×105/C,αz=3×105/C. Coefficient of superficial expansion of faces can be
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A
βABCD=5×105/C
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B
βBCGH=4×105/C
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C
βCDEH=3×105/C
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D
βEFGH=2×105/C
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Solution

The correct option is C βCDEH=3×105/C
Coefficient of superficial expansion of face ABCD=αx+αz=4×105/C
Coefficient of superficial expansion of face BCGH=αy+αz=5×105/C
Coefficient of superficial expansion of face CDEH=αx+αy=3×105/C
Coefficient of superficial expansion of face EFGH=αx+αz=4×105/C

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