# Elastic curve equation - Shear force

**Q. Which of the following is an elastic curve equation for shear force?**

(EI = flexural rigidity)*- Published on 21 Sep 15***a.** S = EI (dy/dx)

**b.** S = EI (d^{2}y /dx^{2})

**c.** S = EI (d^{3}y / dx^{3})

**d.** S = EI (d^{4}y/ dx^{4})

**ANSWER: S = EI (d**^{3}y / dx^{3})