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[" 13.If two rods of length L and "2L" h...

[" 13.If two rods of length L and "2L" having coefficients "],[" of linear expansion "alpha" and "2 alpha" respectively are "],[" connected so that total length becomes "3L" ,the "],[" average coefficient of linear expansion of the "],[" composition rod equals: "],[[" (1) "(3)/(2)alpha," (2) "(5)/(2)alpha],[" (3) "(5)/(3)alpha," (4) none of these "]]

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