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JEE Main Physics question

PhysicsMechanical Properties of SolidsJEE Main

If the work done in stretching a wire by 1 mm is 2 J, the work necessary for stretching another wire of the same material but with double the radius of cross-section and half the length by 1 mm is

Answer: (D)

Solution

. For the new wire, , so

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Question ID VK-154913