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

[" If two rods of length "L" and "2" L 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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