Question:A copper sphere of radius `3` cm is beaten and drawn into a wire of diameter `0.2 cm.` The length of the wire is : 

A `9 m` 
B `12 m` 
C `18 m` 
D `36 m` 

+ Answer
D 

+ Explanation
Volume of sphere = Volume of wire

`:. 4/3 π xx (3)^3`

`= π xx (0.1)^2 xx h`

`= 36/.01 cm`

`= 3600 cm`

`= 36 m.`

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Irin Moni

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