A 5 m long aluminium wire (Y = 7 x 1010 N m-2)
of diameter 3 mm supports a 40 kg mass. In order
to have the same elongation in the copper wire
-3 (Y = 12 x 1010 N m-2) of the same length under
/ the same weight, the diameter should now be (in
mm)
(1) 1.75
(2) 1.5
(3) 2.3
(4) 5.0
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A 5m aluminium wire (Y = 7 × 1010 N/m2) of diameter 3mm supports a 40 kg mass. In order to have the same elongation in copper wire (Y =12 x 1010 N/m2) of the same length under the same weight, the diameter should be in mm : 1.75
Explanation:
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