The length of the wire of 0.2mm radius that can be drawn after melting a solid

Question

The length of the wire of 0.2mm radius that can be drawn after melting a solid copper sphere of diameter 18cm?

Options:

A . 24.3m

B . 243m

C . 2430m

D . 24300 m

Answer: Option D

Radius of sphere = 9 cm
Volume of sphere = [4/3 — — 9²] cm³ = (972) cm³
Radius of wire = 0.2 mm = (2/100) cm = (1/50) cm
Length be = x cm

= > x = (972 —50 —50) cm
Length of wire =
= 24300 m

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