Superposition Principle — Prelims Questions

Three point charges $q_1 = +1,\mu\text{C}$, $q_2 = -2,\mu\text{C}$, and $q_3 = +3,\mu\text{C}$ are placed along the x-axis at $x=0\,\text{cm}$, $x=10\,\text{cm}$, and $x=20\,\text{cm}$ respectively. Calculate the net electrostatic force on charge $q_2$.