A piece of ductile metal is in the form of a cylinder of diameter 1 cm and length 5 cm. It is drawnout into a wire of diameter 1 mm. What will be the length of the wire so formed?
Given,
Diameter of metallic cylinder = 1 cm
Radius of cylinder = 
Length of cylinder = 5 cm
Diameter of wire drawn from it = 1 mm = 0.1 cm
Let length of wire = h cm
so,
Length of wire drawn from metal = 
26