The diameter of a sphere is 6 cm. It is melted and drawn into a wire of diameter 2 mm. The length of the wire is
Radius of the sphere = 3 cm
Volume of a sphere 
On recasting a sphere into cylinder wire, the volume will remain same
Volume of a cylinder 
1cm=10mm
⇒ 2mm =0.2cm
Radius = 0.1 cm
(∵ 1m =100 cm)
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