Question

Name four things you would need to measure when carrying out an experiment to find the Young modulus of a wire

Answer 1

These four things are force applied to the wire, its diameter (to find cross-sectional area $A$), and initial (before application of force in horizontal position) and final (stretched under force) length. The Young's modulus will be

$$E=\frac{FL_\text{initial}}{A(L_\text{final}-L_\text{initial})}.$$