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)