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A 5 m aluminium wire (Y = 7 x 1010 N/m2) of diameter 3 mm supports a 40 kg mass. In order to have same elongation in a copper wire (Y = 12 x 1010 N/m2) of same length under same weight, the diameter should be, in mm : 

(a) 2.0 

(b) 2.3 

(c) 1.75 

(d) 5.0

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Correct option (b) 2.3    


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