Ans : Diameter : 0.06cm. procedure: Diameter of sphere is 18 cm. Radius is 9cm. Volume of sphere is (4π(9)^3)/3=972π square cm.
Since volume is constant even after melting
The volume of long wire is also 972π square cm
Length of wire is 108 m=10800 cm.
The long wire is assumed to be cylinder.
So volume =π×r×r×h=972π
But h =10800 cm