Question
A copper sphere of diameter 18 cm is drawn into a wire of diameter 4 mm . Find the length of the wire . .
Answer: Option B
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Volume of sphere = `(4/3 pi xx 9 xx 9 xx 9) cm^3 = 972 pi cm^3`
volume of wire = `( pi xx 0.2 xx 0.2 xx h) cm^3`
`:.` ` 972 pi = pi xx 2/10 xx 2/10 xx h`
`rArr h = (972 xx 5 xx 5) cm = ((972 xx 5 xx 5)/(100)) `m = 243 m
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