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Q.
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
A.
84
B.
90
C.
168
D.
336
View Answer
Correct choice: A
Explanation:
Let the length of the wire be h. Radius r =1/2 mm = 1/20 cm πr2h = 66 => h= (66 x 20 x 20) x (7/22) = 8400cm = 84m
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