A uniform wire is stretched by a load FFF. The elastic strain energy stored in the wire is EEE.
The load on the wire is increased from FFF to 3F3F3F. The wire obeys Hooke’s law throughout this extension.
What is the increase in the elastic strain energy stored in the wire?
2E2E2E
4E4E4E
8E8E8E
9E9E9E
