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97. When a uniform wire of radius r is stretched by a 2kg weight, the increase in its length is 2.00 mm. If the radius of the wire is r/2 and other conditions remain the same, the increase in its length is

(a)   2.00 mm                                 (b)   4.00 mm

(c)   6.00mm                                  (d)   8.00 mm

Answer-d

(10)

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