AP EAMCET Engineering 21 Sep 2020 Shift 2 Paper

(a) Energy stored in a strained wire is equal to work done by the load to increase the length of wire.
∴ Energy, U= Work done
= Average force (load) × Extension in the wire
=(‌

0+F

2

)× Extension
=‌

F

2

× Extension
=‌

1

2

× Load × Extension