a) 36.9 m
b) 37.9 m
c) 38.9 m
d) 39.9 m
Answer: b
Explanation: Let the length of the wire be h
$$\eqalign{
& \pi \times \frac{3}{{20}} \times \frac{3}{{20}} \times h = \frac{4}{3}\pi \times 4 \times 4 \times 4 \cr
& h = \left( {\frac{{4 \times 4 \times 4 \times 4 \times 20 \times 20}}{{3 \times 3 \times 3}}} \right)cm \cr
& h = \left( {\frac{{102400}}{{27}}} \right)cm \cr
& h = 3792.5\,cm \cr
& h = 37.9\,m \cr} $$
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