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Two tapering bars of the same material are subjected to a tensile load P. The lengths of both the bars are the same. The larger diameter of each of the bars is D. The diameter of the bar A at its smaller end is D/2 and that of the bar B is D/3. What is the ratio of elongation of the bar A to that of the bar B?                     

(a) 3 : 2                                   (b) 2 : 3

(c) 4 : 9                                    (d) 1 : 3

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