Answer :

Given,


Volume of the wire = 66 cm3


Diameter of the wire = 1 mm


Radius (r) of wire = 12 = 0.5 mm = 0.05 cm


Let the length of the wire be l


As,


Volume of the wire = 66 cm3


πr2l = 66


227 × 0.05 × 0.05 × l = 66


l = 66 × 722 × 0.05 × 0.05


Therefore,


l = 8400 cm = 84 m


So,


The length of the wire is 84 m.


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