A known tensile force is applied to a wire. The wire stays below its elastic limit. Which two measurements are needed to calculate the strain of the wire?
- Athe unstretched length of the wire and the cross-sectional area of the wire
- Bthe unstretched length of the wire and the extension of the wire
- Cthe Young modulus of the wire’s material and the extension of the wire
- Dthe Young modulus of the wire’s material and the unstretched length of the wire