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66 cm³ of silver is drawn into a wire 1 mm in diameter. The length of the wire will be
(a) 78 m
(b) 84 m
(c) 96 m
(d) 108 m

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Solution

(b) 84 m
$Length = \frac{volume}{π r^{2} 2} = \frac{66 \times 7}{22 \times 0.05 \times 0.05} = 8400 c m = 84 m$

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