Answer :
Given,
Diameter of sphere = 18 cm
Length of wire = 108 m = 10800 cm
Radius of copper sphere = m = 36 m
Volume of sphere = πr3 =
× π × 9 × 9 × 9cm3 = 972π cm3
Let the radius of wire be r cm
= πr2l = πr2 × 10800
But the volume of wire = volume of sphere
⇒ πr2 × 10800 = 972π
r2 = = 0.09 cm2
r = cm = 0.3
Hence, the diameter = 2r = 0.6 cm
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