When the sphere is moulded into a uniform cylindrical wire volume of the material remains constant
Volume of the sphere ="\\dfrac{4}{3}\\pi r'^3"
Volume of cylinder = "\\pi r^2h"
"\\to \\pi r^2h= \\dfrac{4}{3}\\pi (r')^3"
"\\to r^2h=(4\/3)*1000"
"\\to h= (4\/3)*\\dfrac{1000}{r^2}" length of the wire
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