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Q1
:
66 cubic centimetres of silver is drawn into a wire 1 mm in diameter. The length of the wire in metres will be:
A
90
B
84
C
168
D
336
Solution
ANS:
A
- 84
Let the length of the wire be
h
.
Radius =
1
mm
=
1
cm.
Then,
2
20
22
x
1
x
1
x
h
= 66.
7
20
20
h
=
66 x 20 x 20 x 7
= 8400 cm = 84 m.
22
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