Question

# A 5 m long alummininm wire of diameter 3 men supports a 40 kg mass. In order to have the same elongation in a copper wire of the same length under the same weight, the diameter should now be in men.

- 1.75
- 15
^{7} - 2.5
- 5.0

^{7}## The correct answer is: 2.5

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