Question

For a wire, hooke's law is obeyed for a tension F and extension x. The youngs modulus for the material of the wire is E

Which expression represents the elastic strain energy stored in the wire?

a) 1/2Ex
b) Ex
c) 1/2Fx
D Fx

Answer 1

Option A b/c work done in extending the wire is converted into its strain energy.
Work done= average force*distance moved in direction of force. Hence, option A