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66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:

84
90
168
336

Correct Answer: 84

Explanation:

Let the length of the wire be h.

Radius r =1/2 mm = 1/20 cm

$πr 2 h = 66$

=> h= (66 x 20 x 20) x (7/22) = 8400cm = 84m

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