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One end of a horizontal thick copper wire of length 2L and radius 2R is welded to the end of a thin copper wire of Length L and radius R. Then the arrangement is stretched by applying forces at 2 ends. The ratio of the elongation in the thin wire to that in the thick wire is:
a) 0.25
b) 0.50
c) 2.00
d) 4.00
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