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JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

A 5 m long aluminium wire () of diameter 3 mm 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 mm)

Answer: (C)

Solution

For the same force, length and elongation, requires constant, i.e. $ =

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Question ID VK-154863