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25. The work per unit volume to stretch the length by 1% of a wire with cross sectional area of 

25. The work per unit volume to stretch the length by 1% of a wire with cross sectional area of  1 mm2 will be (Y=9×1011 N/m2)

(a)   9×1011  J                                       (b)  4.5×107 J

(c)  9×107 J                                      (d)  4.5 ×1011 J

Answer-b

(8)

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