The way a wire responds when it is stretched can be explained using the Young modulus $E$ of the wire’s material and the force per unit extension $k$ of the wire. For a wire with length $L$ and cross-sectional area $A$, what relationship links $E$ and $k$?
- A$E = \dfrac{A}{kL}$
- B$E = \dfrac{kA}{L}$
- C$E = \dfrac{kL}{A}$
- D$E = \dfrac{L}{kA}$