NEET 2019 Physics question
When a block of mass is suspended by a long wire of length , the length of the wire becomes . The elastic potential energy stored in the extended wire is :
Answer: (3)
Solution
The weight is applied gradually, so the tension in the wire rises from to while the wire extends from to . The elastic potential energy stored equals the work done against the elastic restoring force, i.e. the area under the force-extension graph: $U =
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