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[" One end of a horizontal thick copper wire of length "2L" and radius "],[2R" is welded to an end of another horizontal thin copper wire of "],[" length "L" and radius "R" .When the arrangement is strecthed by "],[" applying forces at two ends,the aratio of the elongation in the thin "],[" wire to that in thick wire is "],[[" (a) "0.25," (b) "0.50," (c) "2.00," (d) "4.00]]

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