Question

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

• A. 16
• B. 8
• C. 4
• D. 1

Answer 1

The correct option is A 16

$U=\frac{1}{2}k{x}^2$, where $k=\frac{Ay}{l}$