Tick (✓) the correct answer:

Question:

Tick (✓) the correct answer:

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

Solution:

(b) 84 m

Length $=\frac{\text { volume }}{\pi r^{2} 2}=\frac{66 \times 7}{22 \times 0.05 \times 0.05}=8400 \mathrm{~cm}=84 \mathrm{~m}$

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